Mechanically the character looks ok to me. But I have to check the wording on HMRE and how the elemental things are defined before saying for sure. Will be back about this later.
Philosopher of Chartres (or follower of the Breathen of Purity for that matter) is not listed as a social status virtue. I can see most of them being clerks or some other people in the structure of the church if they are linked to the cathedral school of Chartres. Philosopher of Chartres is not a social status virtue. Now, as we agreed with the troupe regaridng Poor and Wealthy V&F, it can be extrapolated that if you are to be a full time member of Triamore and not be linked somewhere else you do not need to have an outside world status. If you are a Franciscan and want to keep your status, or you want to keep your contact with the mundanes in the villages (Faerie doctor) you need your social status. If you are to be a piece of magical furniture in a building like most magi are, you do not need outside social status virtues. Social status virtues are more than a source of V&F: they are contacts, they are who you are and how you see the world and how you are seen by the world. So, if you want to keep your links with Chartres and be subject to canon law you take clerk or another religious officer status.
It is OK to spend XP in Philosophical controlling. Once you get the ability it is something you have after all. Try not to go overboard there though, since this would affect his opening of the Gift.
Having spent 4 years in Triamore maybe an area lore of 1 would be appropriate? Or was Boniface around just for a few weeks until his Gift was opened?
Reading the story of Boniface I do not see much in the way of elementalism or the reasons for his driven personality flaws. What makes him what he is, really. He is morbidly fat by himself, and you do not need a reason for that (people can be rotund by default) but the other would be cool to be expanded. Not an obligation but I was reading this and thinking that for what I had read he could belong to any supernatural tradition, really.
The magical animal companion is not mentioned at all in the background either. It is a story hook, so give me a reason why it is a story hook, please 
enduring constitution and obese together look weird to me, but it is your character. I just have never met obese people that were easy on how they take pain or fatigue. Most of them are short of breath actually, not a positive stamina. But well, most characters are very heavily optimized in this saga, so no big thing here.