Fanart from Japanese sites

Okita
http://www9.plala.or.jp/airi/shinsen/okita2.html

Shinsengumi at Aizu
http://www9.plala.or.jp/airi/shinsen/aidu.html

Saitou
http://www9.plala.or.jp/airi/shinsen/hazime.html

http://www9.plala.or.jp/airi/shinsen/nenga.html

Several Shinsengumi pages are linked up to Aizu "fandoms" which
feature some historical figures from that domain who were
friends/comrades with Saitou