Sion is just Astaroth from Sc5

yeah, but league using inspiration from other games and such isnt a suprise :P

... or any Astaroth, really

http://8wayrun.com/attachments/astsc2art1-jpg.3487/

http://img2.wikia.nocookie.net/__cb20110915182418/soulcalibur/images/4/45/SCVconceptASTAROTH.jpg

http://www.videogamesblogger.com/wp-content/uploads/2009/07/astaroth-soulcalibur-broken-destiny-character-artwork.jpg

http://8wayrun.com/attachments/astsc3cg1-jpg.3497/