[quote=@Lugubrious]
I see. In theory it would still be possibly to have the same effect of invisibility in a limited sense by turning 2D and then directly toward whoever he doesn't want to see him, but of course since this is 3D it would be trickier to manage. I was more or less confused because I was assuming we were going for translating the move itself into the new context rather than the outcome of the move, which is stealth. We may be able to compromise (and also not make up new abilities characters don't canonically have, which I'd rather not do) by saying that he can flatten into a 2D being in 3D space but be able to rotate himself to stay facing whatever target he focuses on, thus maintaining practical invisibility. The limitation would then transition from being shadow-projection to him being able to be seen from the side if there are multiple enemies. Plus, this would still allow him to do things like slip through tiny cracks and hug walls. Would that be alright?
[/quote]
So something akin to Kingdom Hearts's Heartless Shadow or Nobody Creeper effects, but along height rather than being "squished" to the floor?  I'll have to work out how to write the description but it sounds good to me.

[quote]and also not make up new abilities characters don't canonically have, which I'd rather not do[/quote]
I try to only pull things that a character could feasibly have at the point in their timeline.  For example given the nickname Green Thunder, I tend to have Mr. L be still capable of the Thunderhand from Mario & Luigi: Superstar Saga. However given Nastasia's brainwashing and the fact that the magical power was a [i]gift[/i] I give it a psuedo-awareness that keeps him from having full control of the ability.  If he gets it back over the course of the RP it would still nerfed even more, much to his frustration.