End result of fucking around with char building and theorycrafting. I wanted a bow char, and I made myself one.
Mutagen Fighter 20 with Trickster 10. No magical items apart from a simple Composite Longbow. So during actual play it'd have bigger numbers.
All selfbuffs from having access to Wizard 20 spell-book. Have a ton of spell slots too, due to Abundant Casting mythic feats.
A 19-20 bow would get me 13-20 crit range (so 45% crit chance before confirmation). Also has 5d6 Sneak Attack.
-9 AB due to size and Deadly Aim.
A melee reach weapon like the one with 18-20 range would be better, but meh
The character system is quite fun to tinker with, too bad about the game that comes with it...