The last one?
Truthfully, I find I get the most enjoyment out of a character who can do something well out of the gate, and not who is designed to be able to do something well in the future, if his advancement plans end up panning out if everything works perfectly. This goes to the idea of playing a specialist, and then trying to use the specialist to solve all problems using their specialty. If I can do something well, with a character out of the gate, I'm less concerned when the advancement plan goes out of the window. The first example I am using below has no particular advancement plan. The second example was determined to pursue Corpus, but had to take an apprentice earlier than he planned (he's 13 years post gauntlet) because the House needed it..
I've had great fun with my weather maga who successfully used The Incantation of Lightning to prove the villany of a maga of the Order to a crown prince. Before she spoke, she said that may lightning strike her should she lie. The mag lied, so lightning struck her. No words, no gestures, and a finesse roll to make it appear that the lightning came from someplace other than my maga's hand, and I proved the lie to the satisfaction of the prince. The maga never died, because it was cast without penetration... Now, she can't do very much else except weather magic well, she has some facility with corpus, but that was an effort to get to a good Longevity Ritual. She has gigantic holes in her Arts, can't open an apprentice's Arts without creating 6 or 7 deficiencies, and is 22 years post gauntlet.
I have a Corpus magus in another saga, who is almost asexual, he's very cerebral and an academic and is in House Mercere, which has a clear duty for all magi to reproduce to continue the Magical Mercere line. He was pursued by the daughter of a count, who's married. He has envied beauty, and her husband learned of his wife's infatuation which led to attempts on the character's life. Meanwhile the randy daughter of the count was relentless. Finally, my magus had to cast a spell that would satisfy her, because he wasn't going to do it (he'd satisfied his duty to the House and had started the LR, so what's the point?). What would a man who isn't really interested in sex do? In a short-sighted manner, he chose to cast the spell, because it would get her to leave him be. Of course, he botched the spell and he satisfied her so well that everyone in the manor heard her, including his apprentice, another count and his retinue, a covenant companion, and several of the grogs. Now every woman present will want what the count's daughter had and the men will all hate him for it.
Edit: homophones, Oxford commas.