As a quick note, I did do this.
As a follow-up question, do you allow switching of specialties later on? I don't tend to do so, but it's worth asking before it comes up for anyone.
Sorry, that was a comment for Gerard.
But overall, that means I'de like to see the xp spent on each life phases when creating a character. It makes it easier to check stuff like this.
Yes, one can change the specialty whenever the score in the ability goes up. So you can go from Magic Theory 3 (inventing spells) to Magic Theory 4 (enchanting items) during play.
Note that I am still waiting for the troupe to say weight in on whether you think it is ok to have Puissant Parma for a magus just out of Gauntlet. What say you all?
Oh, sorry, I knew that. I was just letting you know I had done so. However, I've just caught a couple oddballs, not distinguishing carefully enough between 0-5 years and 6+. Going back to fix them.
Yes, I was waiting on that. I still go by the core book's statement about Puissant Ability, "You are particularly adept with one Ability," rather than it reflecting extra training. But I'll go with whatever everyone wants.
I'm honestly fine with this. There's teaching Parma, and then there's, well, suppose a season or two of conditioning and preparation, so that the actual process of imparting knowledge has more impact. By that I mean, it's easy to explain away.
Survival (streets) was because he used to be out playing in the city often and his Gift made it harder, although I can spice it up a little if, say, his parents threw him out...although the latter might be Blatant Gift - worthy.
As for the extra Flaw, I chose to mention Infamous Master as sort of meta-joke about the fact that as a magus character, Basilus is built rather poorly. If that's still the case, I'll be happy to adopt it and pick up another Virtue.
I'm also considering picking up other V&F along the way, so we'll see how it goes.
Thank you for the overall feedback, I'll repost the sheet with fixed stuff sometime tomorrow. I
Not just that. That would be a second extra Flaw. My count is FM 3 + Affinity 1 + Affinity 1 + BL 1 + IG 1 + LB 1 = 8 versus CM 3 + WM 1 + Driven 1 + Meddler 1 + Enemies 3 = 9.
I feel foolish for not noticing this earlier, thank you. Affinity with MT it is, then.
[edit] Maybe I'll also pick Infamous Master for extra experience points via Skilled Parens. Thoughts?
Well, I don't really care, he's in my team 
Just remember that what works for you, also works for your opponents.
Second try. This time I used Skilled Parens to bump up the scores, but I might change it yet to Study Bonus, because I'm really uncertain which to have.
Basilus ex Bonisagus
Characteristics: Int 3, Per 1, Pre 0, Com 1, Str -2, Sta 1, Dex 0, Qik 1
Size: 0
Age: 22 (22)
Decrepitude: 0 (0)
Warping Score: 0 (0)
Confidence Score: 1 (3)
Virtues and Flaws: The Gift, Hermetic Magus, Puissant (magic theory), Flawless Magic, Affinity (Muto), Affinity (Vim), Affinity (Magic Theory), Book Learner, Inventive Genius, Life Boost, Skilled Parens / Study Bonus (currently SP), Chaotic Magic, Warped Magic, Driven, Minor (research for the betterment of the Order), Meddler, Minor (helping other magi...?), Enemies (rival researcher), Infamous Master
Personality Traits: Driven to research 3, Meddler with others 3, Rivalry 2, Christian 1,
Reputations: None
Combat:
Dodging: Init 1, Attack 2, Defense 3, Damage -2
Dagger: Init 1, Attack 3, Defense 1, Damage 1
Soak: 1
Fatigue Levels: OK, 0, –1, –3, –5, Unconscious
Wound Penalties: -1 (1 - 5), -3 (6 - 10) -5 (11 - 15), Incapacitated (16 - 20)
Abilities: "German (Franconian) 5, Frankfurt Lore (streets) 1, Athletics (running) 1, Awareness (searching) 2, Brawl (dodging) 1, Charm (first impressions) 1, Folk Ken (townsfolk) 1, Guile (fast talk) 1, Stealth (hiding) 1, Survival (cities) 1, Swim (long distances) 1, Concentration (spell concentration) 3, Artes Liberales (grammar) 1, Latin (Hermetic usage) 4, Magic Theory (inventing spells) 7, Parma Magica (Vim) 1, Profession: Scribe (Elegant Script) 1, Finesse (Vim) 1, Order of Hermes Lore (Important figures) 1, Code of Hermes (Tribunar procedures) 1, Magic Realm Lore (regiones) 1, Philosophiae (metaphysics) 1"
Arts: Cr 0, In 4, Mu 11, Pe 0, Re 5, An 5, Aq 0, Au 0, Co 5, He 0, Ig 0, Im 0, Me 0, Te 0, Vi 11
Twilight Scars: None
Equipment: Wizardly robes.
Encumbrance 0
Spells Known:
Doublet of Impenetrable Silk MuAn 15 Still Casting
Maintaining the Demanding Spell ReVi 15 Adaptive Casting
Disguise of the New Visage MuCo 15 Still Casting
Preternatural Growth and Shrinking MuCo 15 Penetration
Wizard's Reach (Corpus) MuVi 20 Adaptive Casting
Spasms of the Uncontrolled Hand ReCo 5 Still Casting
"Rise of the Feathery Body ReCo 15 Still Casting
Wizard's Boost (Corpus) MuVi 20 Adaptive Casting
Endurance of the Berserkers ReCo 15 Still Casting
Sorcerer's Fork MuVi 15 Adaptive Casting
Starting his apprenticeship at age 7 is on the young side. Unusual but not impossible, however the background should reflect this
Personality Traits scores can be positive or negative, so this should be Driven (research) +3, Meddler +3, etc.
You don't need to specify "with others" for Meddler, as it is kind of what meddling is. 
I'm assuming this is actually a score of 5, plus Puissant Magic Theory. The usual notation for an Art or Ability for which you have Puissant is "12+3" or "5+2". This is important because further advancement in it is based on the first number (i.e. you need 30 xp to advance an ability from 5+2 to 6+2, as opposed to 40 xp to move from 7 to 8).
I want to see a background! 
- I haven't heard many complaints about it before, but if it's a problem I'll give him a couple more mundane years. Up to age 10 perhaps?
- Thanks, I'll note down which i think are positive sides of his character and which might be negative.
- It's 5+2 indeed. I'll note puissance more clearly in the character sheet.
- I'm adding the background below. I expect there's some mistakes and/or things to be changed, but...baby steps..
Appearance
Basilus is a young man in his early twenties, although even now his eyes seem darkened from many sleepless nights, and his posture appears as though he just rolled off bed, seemingly groggy and unfocused on the surface. He wears a long cloak hiding most of his unsightly figure underneath folds of black fabric. His black hair and a hint of a beard are slightly too long and mostly unkempt. Underneath this visage shine mad blue eyes, darting around the environment, ever watchful, compulsively analysing patterns as if that's what he'd been doing with his life for the past dozen or so years.
Personality
Basilus is an exceptionally driven person, following the steps of his parens in a quest to better the Order by improving the Hermetic Theory, bit by bit, until eventually he comes across a breakthrough to shift the current balance of the Order; it is why his expertise is Muto, for focusing on change and hopes of making this change for the better, and permanent in the long run. On the flip side, he seeks betterment of everyone, but doesn't trust them all to do things right alone - he must be with them to see things through and help however he can.
Background
Young Friderich was a son to a moderately wealthy merchant family, but as a second son, he was spared the graces of privileged upbringing. Instead, the kid took a liking to wandering the streets of Frankfurt even at a young age - which led to a healthy number of fights, which he couldn't win due to his frail body. It led to his parents diffusing these issues time and time again, and didn't forget to scold the confrontational brat. Friderich stayed this way until four or five years of age, still practically a child, when things started to change. The streets became more dangerous, the fights more often caused by others' reaction to the kid rather than him causing trouble, even his parents ended up turning him away. Who would've known how his life would go if not for a chance encounter with Antonio ex Jerbiton, a gentle man who showed the kid compassion, and his first master.
Friderich's apprenticeship under the Jerbiton was short-lived, lasting only the first few years - when it was time to learn a few Arts properly, to everyone's surprise, Friderich exhibited incredible potential in a particular mixture of Technique and Form, and yet a chaotic, sometimes unpredictable method of working magic, something Antonio attempted to correct to no avail. Eventually the word of Friderich's unusual case reached the ears of Homer ex Bonisagus - an old researcher infamous for his unreasonable experiments who took great interest in young talents and other curiosities. Exercising his right to request an apprentice, Homer took young Friderich from begrudged Antonio, a move that haunted the apprentice's and the ex-master's memory for years to come.
Friderich's stay at Homer's covenant was longer and more fruitful in events. It was then that he met soon-to-be Angela ex Bonisagus, a female apprentice of another researcher, a few years in apprenticeship ahead of him. She was the greatest friend and enemy to Friderich in that period - a playmate, someone to open a heart to, a kind personality to spend time with. And yet, their relationship developed into a tense rivalry. Angela envied Friderich for the privilege of being taken apprentice by Homer (overall more skilled than Angela's master at the time, and known for his picky attitude when choosing apprentices) while Friderich envied Angela for having a normal apprenticeship, rounded knowledge and open mind while he himself felt experimented upon, as Homer proceeded to focus his teachings around Muto Vim and prepared the boy for a lifetime of commitment, something that broadly talented Angela tried to mimic. In a mental coin flip of chance, by the end of this conditioning Friderich eventually grew to like the combination, and the longer he studied, the greater his drive to research became, something Homer wanted to see all along.
At the young age of 22, Friderich was gauntleted and became Basilus ex Bonisagus, and his relationship with now accomplished Angela turned from healthy rivalry to becoming sworn enemies, and the battleground was a field of Vim research. He stays in contact with his pater, and although he's not in training anymore, the young man still heavily relies on Homer's teachings, making him feel like it's them against the world that doesn't understand the importance of experimentation and exhaustive research.
Of course! That's certainly fair.
I adjusted a couple specialties. Here it is, broken down into life phases:
Childhood:
Area Lore: Stonehenge Tribunal 1 (Hermetic Sites) [5]
Athletics 1 (Dancing) [5]
Awareness 1 (Alertness) [5]
Brawl 1 (Dodging) [5]
Charm 1 (First Impressions) [5]
Folk Ken 1 (Men) [5]
Guile 1 (Slippery Truths) [5]
Language: Brythonic 5 (Welsh) [75-75=0]
Stealth 1 (Indoors) [5]
Swim 1 (Not Drowning) [5]
Between then an apprenticeship:
Concentration 1 () [5]
Etiquette 2 (Hermetic) [15]
Language: Latin 5 (Hermetic) [75]
Organization Lore: Order of Hermes 1 (House Bonisagus) [5]
Profession: Scribe 1 (Illumination) [5]
Apprenticeship:
Artes Liberales 1 (Ceremonial Casting) [5]
Code of Hermes 1 (Investigative Procedures) [5]
Concentration 2 (Spells) [15-5=10]
Intrigue 1 (Hermetic) [5]
Finesse 1 (Speed) [5]
Magic Theory 3+2 (Spells) [30]
Organization Lore: Durenmar 1 (Tractatus) [5]
Parma Magica 1+2 (Vim) [5]
Penetration 1 (Perdo) [5]
Philosophiae 1 (Ceremonial Casting) [5]
Single Weapon 1 (Heater Shield) [5]
Perdo 10 (1) [56/1.5=37]
Rego 9 [45]
Ignem 7 [28]
Vim 14 [105/1.5=70]
Wizard’s Icy Grip (PeIg 30 / +28), Mastery 2: Adaptive Casting, Multiple Casting
Demon’s Eternal Oblivion (PeVi 20 / +26)
Unraveling the Threads of Vim (PeVi 20 / +28), Mastery 2: Adaptive Casting, Multiple Casting
Aegis of the Hearth (ReVi 20 / +28), Mastery 1: Adaptive Casting
Suppressing the Wizard’s Handiwork (ReVi 25 / +25)
Sustaining the Demanding Spell (ReVi 35 / +25)
Swim 1 (Not Drowning) [5]
Isn't that swimming? I mean it translates to getting to the surface. It would think it is not a specialty. It is either too broad or a munchkin move.
That’s one suggested In the book
No, that's far from all of swimming. It doesn't cover swimming quickly, swimming distances, diving, maneuvering well, etc.
It wasn't a complaint, just a comment!
Some magi start that young, but not that many. If you want your magus younger, that is fine.
But I would say that wandering the streets of a large city and getting into fights at age 4-5 is very young in my view. Again, this is just a comment.
Seriously? I have never seen it before. If it is in the book I can't argue but it is stupid. Everyone swims to prevent drowning. That is the main purpose of swimming.