An "interrupted" option for dialogue, where that dialogue interrupts the current chatbox when triggered (i.e. via escaping an enemy). I've always felt kinda weirded out when the teasy enemy dialogue kept going, even after escaping the enemy's grab.
A "Cosy" alternative animation sequence and additional dialogue lines that play (or have a chance to play, in the case of dialogue) when you have the endosomatic heart. Japes struggles inside Mirrim's mirror dimension... even while he's not taking damage. I would love to see him simply... cosy up, inside her. Additionally, an option to ignore the animation's speedup, if adding animations is not desired.
Adding onto the above, maybe more alternate animation cycle options depending on which status effect you enter the enemy with?
"Withered" effect added to the Item Giver (the Withered Heart that you get from that cactus enemy). I'm under the impression that it contributes towards absorption faster, so correct me if I'm wrong.
More plant enemies.