The documented Interlude conditions for claiming Hero status.
Interlude requires the main class, above level 75, to become a Hero from the waiting state. A subclass cannot claim that status. HP, MP and CP are restored once more after the Olympiad countdown starts.
A dated C5 revision and an undated Hero manual disagree on minimum participation. Earlier competition timings also differ from the manual. The reviewed Interlude notes do not resolve these figures. The historical tie order compares points, then wins, then win rate; a complete tie yields no Hero.
Use the main class when entering Olympiad preparation; changing to a subclass after registration makes the character ineligible. Being in a party does not mean that party will fight alongside you: the participant leaves it on transfer to the stadium. Check automatic shot use after arrival, because the documented stadium transfer cancels it. These preparation rules do not settle the disputed minimum match count or historical match timers.