Board Thread:Fun and Games/@comment-30670450-20180101192143/@comment-32271305-20180101193812

Where it says:

* For missions that require a specific character, only characters with the same character name will be counted (regardless of their second name).

''- Example: Clear a stage with Goku on your team.

O [Determined Defender] Goku X [Innocent Challenger] Goku (Youth) X [Supreme Warrior Awakened] Super Saiyan Goku

I'm pretty sure that O means "yes, it counts", while X means "it doesn't count".