Misskey doesn't have Mastodon API.
There's some editing of emoji picker.
Reading this mess, I discovered nostr:npub122glfka8k4m5p8g5radee5hmhmh620slp5jyt7fhwvcjs6nd7azq722h6e added support for Calckey who also changed name, but not original Misskey who have 200x more users. I'm disappointed :meow_glare-zoom:
Discussion
Maybe "as a Feature" 🤔