Senku is a fellow user. He owns quite a few characters, the main ones which pretty much everyone in the SRB2 community knows of: Senku, Senya and Nitemare. All three he has made a character wad of which can be found at srb2.org. (though Mystic hardly updates so the ones there are not the most recent.)
The current updated wads are: Senku 5.0 Senya 3.0 Nitemare 4.0
He has finished Senku 5.0. Senya 3.0 is complete and Nitemare 4.0 hasn't been started.
Senku made a barrel object for JTE to add into SRB2JTE. JTE being nice added in character support for Senya and Nitemare so they have abilities in SRB2JTE.
That is all for now.