In the web-series Mortal Kombat: Legacy, several important characters like Jax, Sonya Blade, Cyrax, Sektor and Kano not appear in season 2. What is the reason for removal of this many important characters from the second season?
I don't there is an overarching reason, but some specific examples can be discussed. Kevin Tancharoen, the director of the second season, said in an interview:
To confirm this, Jeri Ryan posted on her Twitter account:
Michael Jai White posted something similar on his Twitter account:
Darren Shahlavi (Kano) also used his Twitter account to comment:
When pressed on why (and visible on the above link), he said:
So that's hopefully given some reasons as to at least three of the characters - Kano, Sonya and Jax - not returning.
I'm aware that is only a subset of the characters, but it appears that a mixture of one-season-only origin stories, combined with the actors having other commitments, led to quite a few cast changes for Season 2.