in the cartoon Steven Universe there are certain characters who have the ability to perform a 'fusion'. Basically they do a dance and then fuse together to form an entirely new being. This being has traits of the characters who fused but generally has it's own autonomy or sense of self.
The relationship between the characters has an effect on how 'synchronised' or comfortable a fusion is. ie; the closer they are the more harmonious the fusion is.
(more info & examples; http://steven-universe.wikia.com/wiki/Fusion_Gems )

It's become popular in a number of fandoms to draw 'fusions' of particular characters and imagine how they would interact in that context.

I would give ANYTHING to see this concept with daredevil. (I'm particularly interested in matt and foggy but honestly im interested in all combinations of everyone)