Sengoku Basara 9th Anniversary Party

I drew this picture for Raindrops' Sengoku Basara Poll:
http://www.raindropsanddaydreams.co.uk/2014/04/results-of-unofficial-international.html

There are 41 characters out of a total 45 playable characters! Can you figure out who's missing?

This took about 3 months to draw (because I'm reaaallly slow).