NPC sidekicks/pets?

I once appealed for "twin" Arrancar (one Arrancar character that was actually two Arrancar that fuse for their Resurreccion), but it was declined.

As for just like NPC sidekicks, I believe you can use NPC's freely as long as they don't go beyond ML rank and can probably only use the most basic of racial techniques.

Could be wrong on some details, but that's how I remember it.

so you are allowed to have an NPC partner but they are not allowed to participate in battle at all. Unless the opponent approves for you to use a NPC in combat where they techniques will not be approved by mods. Next if you want someone to participate in combat they have to be either a summon, a minion or a item.

Yeah so re-affirm above:

You can control NPCs up to ML-A ordinarily, but unless you have permission, you can't fight with them and even then you have to have all their techs etc. approved. Eventually though one does wonder if it isn't worth drafting a profile for them or something at least.