First of all, i'll explain what exactly a Bounto is and what role you'll be playing, to keep all the "WHA DO TRAIN AS BOUND?" questions aside.
The stat you train as a bounto is relative to what Doll you choose when you first become Bounto. To become Bounto, go to Soul Society from the portal in Urahara's basement, head southeast, and basically get to the eastmost side of Soul society, where you bump into the wall. Then start heading down, past the empty "houses"(buildings with half-opened doors that have no warps), and into Ran-Tao's lab. Talk to Ran-Tao and choose which Doll you want. Ran-Tao's lab is usually bugged, so if you are stuck, do NOT scream "HALP GM I STUK" in OOC. Kindly whisper a GM asking them to summon you out of a bugged room.
Now i'm not a genius, and I haven't -*test*-('")ed all of the Dolls, but heres a basic overview of them.
Metal Doll - Upon gaining it at level 50, you get Metal Ball and a strength boost I think?
Mastery - Larger strength-boost (3.3x or something crazy like that)
Wind Doll - At level 50, you get it as a wind blade, and you get Wind Licht, a ranged Getsuga-Tenshou like attack, plus a STR Boost.
Mastery - Electric Damaging Field, BETTER Str. Boost.
Fire Doll - Level 50, you gain Fireball and maybe a Def/speed boost?(Small if you get them)
Mastery - You become as fast as Tensa Zangetsu and gain more defense, and soon, fireball will do more damage and have less delay.
Sword Doll - Level 50, you gain a str. boost, I think? I'm not sure on this one. Haven't -*test*-('")ed it out much.
Mastery - NO idea. I don't think anyones mastered it yet.
Pretty nice guide if I ever get around to it I'll use a diff key and make a Sword Bounto and lvl it to 120
i just made a quick new guide becuase this one si missing a lot and it would be faster for me just to remake a new guide instead of posting it all here and you rewriting
good job for starting a bounto guide though i was just a bounto and knew the other bountos so i knew what they got for most part