Could and should be a decent character but as per usual oasis have ruined any semblance of balance the chinese devs gave this character.

In china his mystery costs 0, 0 battlefield cooldown and is unavoidable... in other words it is viable, what we get is a character outmatched by edo itachi, kurenai summer, ibiki, even the likes of shurado and ginkaku, since they are more complete characters, with a weak ass mystery and pointless passives this zetsu is a dud.

In china his passive 2 also recovers chakra when an akatsuki unit uses a mystery making him decent support for the likes of konan,kakuzu eg, kisame etc, but for us all he can do is buff damage when a very specific debuff is active making it a non factor given that immune characters are given free to all new players and zetsu can only suppress immunity until the end of the current round. Overall an utterly useless passive

There is not a single reason to be made for anyone to ever recruit this character in the english version, doesnt matter if you get a pack from the slot machine or tsuku, every other option in every other pack is discernibly better than one of the overarching antagonists of the entire naruto universe. Whatever oasis were huffing when they thought he needed nerfed must be some good stuff