There are 15 Ultra Street Fighter II: The Final Challengers characters on this checklist, across 20 figures.
The most featured are
Blanka (3 figures), Akuma (2 figures) and Cammy (2 figures).
Akuma
Balrog
Blanka
Cammy
Chun-Li
Dee Jay
Dhalsim
E. Honda
Fei Long
Guile
Ken
M. Bison
Ryu
Sagat
Vega