Here is a listing of the developed alternate skins that are not Marvel. Please message me, or leave a comment below if a skin has yet to be added. Comments and suggestions are welcome as well as notes regarding errors or broken links.
ARTISTS (alphabetically listed)
Aventureiromax ~~ Alice -
Re1, Re Apocalypse, Re Extinction, Re Afterlife, and Clone, Batman -
Beyond, Superman -
Classic, and Beyond, Superboy -
Classic, and Recovery, Wonderwoman -
Classic ps2, Classic ps2 2, Classic, Classic 2, Modern, Modern 2, Lord JLU, Classic 3, Modern 3, Pink, and Dark Wondergirl -
Cassie 1, Cassie 2, and Cassie 3, Donna Troy -
Classic, and Aka Wondergirl, Supergirl -
SG1, SG2, and SG3, Captain Atom -
CA1, CA2, and CA3, Black Adam -
ClassicBlaw ~~ The Green Latern -
Modern, Green Lantern -
Red Lantern Corps, Joker -
Modern, Classic, Movie, Humane, Two Face, and Ronald McDonaldDeedooo ~~ Samus -
Justin Bailey, and Zero suitMidnightphoenix123 ~~ Alice -
Madness Returns, Alice -
Madness Returns altScabbia ~~ Claire Redfield -
Code Veronica XTommyboy2002UltimateVeNoM ~~
GrifterNON MARVEL CHARACTERS A00xx / Alice - Madness Returns | 00xx / Alice - Madness Returns alt |
00xx / Alice - Resident Evil 1 | 00xx / Alice - Resident Evil Apocalypse | 00xx / Alice - Resident Evil Extinction | 00xx / Alice - Afterlife | 00xx / Alice - Clone |
B  |  |
00xx / Batman - Beyond | 00xx / Black Adam - Classic |
C  |  |  |
00xx / Captain Atom - 1 | 00xx / Captain Atom - 2 | 00xx / Captain Atom - 3 |
 |
00xx / Claire Redfield - Code Veronica X |
D  |  |
00xx / Donna Troy - Aka Wondergirl | 00xx / Donna Troy - Classic |
G  |  |  |
00xx / The Green Lantern - Modern | 00xx / Green Lantern - Red Lantern Corps | 00xx / Grifter |
J  |  |  |  |  |  |
28xx / Joker - Modern | 28xx / Joker - Classic | 28xx / Joker - Movie | 28xx / Joker - Humane | 28xx / Joker - Two Face | 28xx / Joker - Ronald McDonald |
P  |
00xx / Poison Ivy - DC Universe Online |
S |  | 
|  |
00xx / Superman - Classic | 00xx / Superboy - Classic | 00xx / Superboy - Recovery | 00xx / Superman - Beyond |
 |  |  |
00xx / Supergirl - 1 | 00xx / Supergirl - 2 | 00xx / Supergirl - 3 |
 |  |
00xx / Samus - Justin Bailey | 00xx / Samus - Zero Suit |
W  |  |  |  |  |
00xx / Wonderwoman - Classic ps2 | 00xx / Wonderwoman - Classic ps2 2 | 00xx / Wonderwoman - Classic | 00xx / Wonderwoman - Classic 2 | 00xx / Wonderwoman - Lord JLU |
 |  |  |  |  |
00xx / Wonderwoman - Modern 1 | 00xx / Wonderwoman - Modern 2 | 00xx / Wondergirl - Cassie | 00xx / Wondergirl - Cassic 2 | 00xx / Wondergirl - Cassie 3 |
 |  |  |  |
00xx / Wonderwoman - Classic 3 | 00xx / Wonderwoman - Modern 3 | 00xx / Wonderwoman - Pink | 00xx / Wonderwoman - Dark |
Yes I am still adding more, just so you know XD
Who else made Non Marvel skins besides the above names listed?