Who are these characters in the end of the last episode's still?
Going counter clockwise from the top left:


Kinkaku (upper, older brother) 
Ginkaku (lower, younger brother)
Suzuki Satomi (Benten, as a schoolgirl she wears the blue blazer and has her hair up)
Yaichiro (tiger ver.)
The Mom (of the four Shimogamo brothers, house mother ver.)
Yasaburo (cross-dress ver.)


Kouji Kumeta, best known for the Sayonara, Zetsubou-Sensei manga, did the original character design for the series.