Hello there, and this is Kuronue and I's betta, Ikiryo. I believe he's a Cellophane Double Tail.
And fun trivia (Ikiryo is the name of a japanese mythological being. Said to be is a manifestation of the soul of a living person separately from their body )
So here are some pics of him, I love how in the right light, his fins get this translucent blue color that adds to the ghostly theme of him.
and the tank (because I'm not sure where to post tank images in which subforum. If someone knows, I'll edit this so that the tanks go there, otherwise it'll be in this thread)