Does Bajimbo have a OD attack anyways? And if he has his OD bar al the way up, is there a way that you can pay him more to use it? Or is it just random?

He has an OD yes, it doesn't do anything special except give you a free attack. Depending on your compatability (yes he has a hidden compatability gauge) he will do a more stronger attack. So take not that if you high summon him he will instantly attack, so if it's crucial you pay him alot of money to get Zanmato for example, then I sugest you do no either high summon him, or summon him when he already has a full OD gauge.

I think you mean Yojimbo and no he does'nt have an OD he just has four special attacks. All moves are random but if his OD bar is full, generally it will cause more damage, occasionally, it will affect the chance e.g. Yojimbo with full OD. I paid him 1 Gil cuz thats all I had left, and he did Zanmato

Sorry Neo Xzahn, didnt realise ud posted!

His OD bar also gives him a higher chance for Zanmato, his special special attack that chops the enemies in half, like Odin.

I had to pay 300k. but the good part was that i was able to level up as i trained and won gil.

How much you need to pay depends on your compatability with him, and on the monster level. Monster levels vary from 1 through 5 and naturally higher levels require more gil. For example all the Dark Aeons and Arena bosses are considered level 5, if you'd want to Zanmato then you'd need to have high compatability and 1.370.000 gil for Zanmato to work. (I know a huge deal about Yojimbo and suck because I was alwasy fascinated by him, got any quesiont? Just ask me =p ).