Ah man I got a few C:.
Mako Tsunami from YuGiOh, Miroku, Genghis Khan (historical cosplay hah). And Ikki from Air Gear 8D. And Shonen Bat (= any excuse to wear rollerblades while cosplaying XD).
Day 0: Nishinoya Yuu[casual?] (Haikyuu!!)
Day 1:Echizen Ryoma, Kaidou Kaoru (Prince of Tennis)
Day 2: Nishinoya Yuu (Haikyuu!!)
Day 3: Sanada Genichirou (Prince of Tennis)