I've never seen a Kamfa look like that but I'm definitely not a FH expert I think they're generally a more solid color covered in pearls and the shape is weird on this guy IDK
definitely not a rainbow the shape is all wrong for that too
Umbee cross? That would be cool but very unlikely. I think someone crossed one with a Loisell once but that's not exactly common to put it lightly.
We need more pics.