Since Yasuo is very Asian cultural influenced, why not find some idea from Asian culture? For example Yasuo wearing white cloak and holds a giant(Not to big in terms of diameter) caligraphy pen, and when he attacks instead of blood, ink is spilled everywhere. His wind wall could be like a scroll being opened up in mid air.
The picture is where I got the inspiration from. Probably not the same, long hair and white cloak, not as much beard.
The skin sounds cool although there's one problem. http://boards.na.leagueoflegends.com/en/c/skin-champion-concepts/QF27Eqrp-champion-concept-kit-the-silent-stroke There's a bunch of champion ideas for a character using a giant paintbrush or some sort of ink tool and I'd love to see one of those champions in the game. But it's almost impossible to have both of these things...
