So you think thats good idea? What would your character be doing during all this? Maybe she goes back with Byakuya and when Nero invades with Ichigo the two of them fight. I mean Nero and Hana. I'd like for Nero to fight a Captain but I'm not sure which one would be best. I can eliminate most of them as candidate because they have important roles to play. I think the only ones that don't have important roles or fights are Gin, and Tosen. But Tosen seems like a boring fight and I'm not sure I could pull off Gin. If we diverge from canon events though then there are some that are still out. Kurosuchi, Kenpachi, Byakuya, and Aizen are out as no matter what they're vital in my opinion. Don't want to fight Tosen or Komamura. I'd say that the best possible people to fight would be Soi-fon, Hitsugaya, or Gin.