Had a re-look at the poll and Impy's comments for you and I can clear things up:
Monster Monsoon basic premise is, you are the protag, you select a mercenary companion who will help you to escort people through monster infested lands. These people you escort will attempt to flirt and fuck your selected companion. So in Impy's Language:
Protag: The Person you play as.
Companion: The mercenary you pay to help you escort the rivals
Rivals: Clients who you will protect while they try to flirt and fuck your companion.
Protag: Currently it will be a choice (confirmed by Impy) between a futa mage or a wolf boy.
Companion: Top two are a female witch who might be the protag's mother and a futanari sword master.
Rival: Current top two are a futa fortune teller who might be your sister and a Dark Elf postman who looks suspiciously like a Shota.