The character in 16, 18, & 33 is Sandaime Muramasa. The artist is Kouki Kuu. http://kou-k.sakura.ne.jp/kiton/ http://danbooru.donmai.us/post/index?tags=sandaime_muramasa http://danbooru.donmai.us/post/index?tags=kouki_kuu
09 is Kotoji http://cotodq.axisz.jp/top/top.html http://danbooru.donmai.us/post?tags=kotoji
40, 41, & 45 are Hairu http://www113.sakura.ne.jp/~undermine/ http://danbooru.donmai.us/post/index?tags=hairu
34, 44, 49, & 50 are Yn_red http://www.webgraveyard.net/ http://danbooru.donmai.us/post?tags=yn_red
08 is Jajala http://b.dlsite.net/RG10016/ http://danbooru.donmai.us/post/index?tags=jajala
Base +8, Pmonkey +7, foursigma +6, raptor54321 +5, Andre Tha Giiant +4, ragekick +8