Aila

Aila is the Arena master and Champion who lives with Castalia.

When you first meet him he will be arguing with Castalia about whether strength or intelligence is better. Choosing intelligence will give a -10 starting relationship with you, whilst choosing strength will give a +10 starting relationship with you.

Like most other Town NPCs, Aila has a few unique aspects to him. First is the unique skill that the MC learns once relation hits 100, which is used exclusively with them in battle. With Aila it's Overwhelming, which grants StrengthBuff and Focused to Aila for 2 turns. He also has LastingStrength, which gives the ally unit he fucks Strengthen for the remainder of the battle. Aila's unique genetic trait, Savage, gives even more power, and as Aila joins at level 10/10 he's ready to join battle immediately. However since he joins at his level cap, there's limited benefits from Strong, and as a Champion there's no bonus stats from ranking up either. This means that, though Aila is a powerful addition to your party early game, he falls behind in the late game due to limited growth.

Otherwise he will have quests for you like all the other Town NPCs, rewarding you for winning in the Arena with various battle-related items. Aila can also train your units, teaching them Scavenger or helping your units level up with experience.