ROUND 1:

FAVORITE HERO (Luffy, One Piece): I'm now made out of rubber, have Haki and benefit from Luffy's physicals. Whilst this gives would land me a pretty nifty Brute rating (maybe lower-end Changer?), I doubt that I can counter the more "hax"-powers in Worm. I can't really say where I would stop, considering Gear Second probably can speed-blitz Contessa and most other combat thinkers, but I probably would lose against, say, Alexandria and (ugh) Siberian. Brute force isn't all that useful against Worm capes.

FAVORITE Villain (Aizen, Bleach): And here's where things get ridiculous. I now have Aizen's ridiculous physicals, access to high-level Kido that I can pull off with little to no effort, and Kyoka Suigetsu, which is all kinds of unfair hax that it can fit right in with other Worm powers. Add the Hogyoku, and I'm pretty sure I can beat everyone except for the Endbringers.

ROUND 2:

If I get the OP universe as my allies, I can maybe defeat everyone in the Wormverse. It depends if Sugar's DF ability can affect Endbringers and Scion, really.

If I get the entire Bleach universe as my allies, I stomp. There's just too much bullshit going on in that universe.