"Big-Stick-Smash-Brutus" seems like a silly name to me, like a meme that is amusing at first but then is going to turn your character into a meme character and make it hard to take seriously. That's why one of my rules at session 0 is "no meme names" - I find they set a tone for the campaign that contributes to treating everything like a joke, which then makes me not want to DM.
But if you are going to go with that name, you kind of have to go berserker because he sounds dumb as a stump. Certainly not Ancestral Guardians or Zealot, which both imply strong belief systems. Maybe Wild Magic, I guess. My concern is that you haven't really given us much to go on for this guy's character, so it's kind of hard to offer any suggestions. What does this guy really want - why is he out there being an adventurer? What's his background?