I havent fully completed the game, but if it doesn't exist having ball of bandages would be cool. Maybe it has less hp but gives some hearts back when it dies or just produces them at a slower rate than chad? Or less hp again but charms enemies, like in the civil war challenge, when it dies. Or even make it upgradable like in BoI, having 1 is just a worse cube of meat, having 2 lets it shoot, having 3 lets it sometimes shoot charming tears. I think having a different blocker would add some variety to the staleness of selection others are talking about (although i do think 4 slots is good)