The three ideas of an arcane gish flavour which I've seen and like are:
- Warrior built to kill things normal humans can't. Something like a witcher.
- Elite 'magic guards' of important individuals and items. The type of person who would be used by an order of wizards to guard all their precious stuff. A bit like the jedi temple guard. Obviously a bit restrictive as if you're sitting guarding something, you're not adventuring.
- Alternatively elite warriors which are often sent out to retrieve items of power and knowledge for safekeeping by said order of wizards.
What I'd dislike as the entire class lore is 'person who magics and combats'. That isn't a class lore or theme, that's just a description of how they fight.