Unfortunately he's OP on both sides
Before any fireflies or camps his scoring potential is well over 120. His synergy with the other characters is well above the others
I think the biggest issue is the one which gives you a reroll for one green. Get that early and you can pretty much pick and choose your dice
Get any of the other companions which score high for not having a colour i.e. red and light blue for six points and it's pretty much game over
He's not invincible. Orange and blue are ok with the right cards but definitely not as strong. On side one, the early path of greens is a given head start for braccio and his dice
I mentioned my thoughts on this to Thoun early on and I messaged Bombyx to see if they would consider an official variant of random characters so it could be added here.
I have had no reply so far
Hopefully something will change as I think it's a fun game but if does feel uphill towards certain characters which I think will diminish the replay value