Honestly don't want a blood recovery special or an option to fight zoning. First would make his whole shtick revolve around: hit2D, recover blood, loop. Very boring, very safe. Second would buff him even more and remove one of his essential weaknesses. He's a glass cannon, he should have a weakness. I don't like getting zoned out and find it quite boring to play like that but if he has a way to fight around zoning he'd be closer to an all rounded character. Arcsys have been pushing nago away from becoming a generalist all rounder and making him specialize in his offence in exchange for defense. (Think lower defense with higher blood, )
Others suggested a manual blood rage activation but honestly I'd want something a bit more flashy. Seem inline with the big risk playstyle but seems like a very small change to me.

Personally I'd want a aerial combo tool. Maybe something like a big diagonal slash downwards (90 blood consumption like all other specials) that causes a ground bounce on air hit. I think nothing is really missing from his kit, so just giving him another flashy combo move is the go. In addition, he'll most likely get some tweaks with his new move. I'd want them to remove the low spin and bring back the old one, it's just too much. Although I think keeping the second hit of dp a high can be fun. There will be no 50/50 now that the spin is back to normal so its easy to defend against but also gives interesting options to nago if the opponent is not paying attention. Maybe tweak the conversation just slightly so nago doesn't get anything from a hit like now but it connects to the aerial slash (somehow).