I don't have a specific character on this one, but I was pondering the viability of troll mages the other day. Here are my thoughts on it.
Troll metatype cost 40, you get a ton of body, more than most mages would have but body is always nice, and a bunch of strenght, which might be hard to put to good use but it come with the package. 40 points may seem like a lot but you would have spent at lest some of that on body anyway, so I don't think you are really overspending here. Point of armor and free thermal vision, all good. Now the huge downside, lowered max on Chr, Intuition, and Logic.
It seems to be the main drawback of the troll mage is your dice pool to resist drain. Your casting/summoning are magic+skill, so there is no reason you can't be as good at those tasks as any other mage. But when I build a mage I really like to have a dice pool of 10 or more for resisting drain. The troll will have to hardcap at least one, and maybe two stats if you go with a chr tradition, to get to the same level. Thats very inefficient in terms of build points. If you softcap will and choose a non chr tradition and softcap your drain stat you are at 9 dice. Not terrible, but slightly behind the curve. You still on average resist 3 points of drain.
In compensation for that, you get some extras in other areas. Your naturally high body and natural armor mean you can wear much more armor than the typical mage, especially in situations where subtle doesn't matter. If you wanted to make use of that strength then a modest agility+increased agility spell+a combat focus+blades skill =axe of the trollish lords. Again, its hard to take a combat axe to the high end club, but when non-subtle is called for you have a nice secondary option.
On the downside, being both the troll and the mage really makes you the primary target for the alpha strike. Hopefully the GM would not be too much of a schmuck about that.
Anyway, just musing. Anyone every play a troll mage in actually play? How did it go? Any advice? Just crunching numbers in the abstract I think I would put it in the "playable but slightly suboptimal" category due to slightly lower drain pool.