(..) arena fighter who fights unnarmed (a kind of MMA pro fighter) (..)
What do you thik? Any advice on race or stats? Or when would be ok to get the barbarian level?
I like the concept! I'd try to give him Athletics, though, in order to make him better at grappling, one of the cornerstones of MMA (grappling, striking, wrestling). Maybe a tiny bit more strength for this aspect? Would be better if you include a bit of barbarian, too.
The Soldier background would fit well enough as a theme, no? You'd have to have learned and honed your skills at some point besides alley fights.
As for stats, maybe one or two more points for wisdom, which seems to be a fairly important secondary attribute for monks. With Larian's explicit goal of having failed skill checks be fun too, personally I wouldn't worry about charisma
too much for a character that doesn't have it as a primary or secondary attribute. So, maybe move some Int/Cha-points over to Wisdom.
Race I would pick the one you can identify with the most. With
customized origins (+2 to one stat, +1 to the other, regardless of race) humans are apparently no longer the "best" pick (see
5E race breakdown for monks, but honestly - if I can't fit a certain race into the image I have in my head, that doesn't matter.
As for multiclassing - no idea. I normally never multiclass any of my characters.
So.. maybe something
like this? I prioritized strength over charisma here, although I guess you could also go 10 str/10 cha or 8 str/12 cha. So many agonizing choices! I love it.
Edit: Found this article for barbarian/monk multi-classing ponderings:
https://www.cbr.com/dnd-5e-op-barbarian-monk-build/
I guess adding Barbarian
would be very useful for the MMA theme, although I'm not sure if you'd have to focus more on strength or dexterity.
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Really hoping the Hermit background will be back in the release version, because it's integral to my Druid idea.