I really like the idea of the whole Spirit possession/fusion/whatever thing, but the only thing anybody ever draws with it is sexual - I'm not trying to shame, there kinda is something slightly inherently sexual about possession and fusion when you think about it, but I really want some variety.
Although it can be agreed that Kirby's Avalanche doesn't remotely fit the series at all, even Epic Yarn fits more than that. Also, Squeak Squad's only praised for its villains (except the last boss), even within the fanbase.