You can use this line in the script section of the conditional branch:
$game_party.actors[0].id == event_id
replace event_id with the id of the character you wish to check for. So let's say you wanted to check if the leader is Aluxes(this is in a new project) you would check it with this line:
$game_party.actors[0].id == 1 # If leader is Aluxes
Good luck Adraboo :thumb:
Over and out - Gando