Aatrox and Devilman - reference or coincidence?

for those that don't know Devilman is a really old manga/anime and if you look at Aatrox it resembles Devilman.

http://www.mangaforever.net/wp-content/uploads/2015/09/deviman-vs-hades-wall-634x312.jpg http://img14.deviantart.net/d26b/i/2013/315/8/c/league_of_legends__aatrox_by_ravermore-d6tquk1.jpg http://orig09.deviantart.net/e2db/f/2011/051/3/e/devilman___moon_spell_by_asgard_knight-d3a13sc.jpg (or someone at Riot is a fan)