Who could Maeve be???

Transcript:
Lucas: Sorry Finn, I-
Finn: It's okay. We deposit food and beverages in Shelters on the way to Atlad. We can drink and eat what we bring, and we can sleep here for free. Other things, we have to pay for, but we're keeping money for when we'll be in Atlas.
Lucas: Okay... Hey Copper! Mind joining us?
Copper: Oh really? Don't mind if I do!
Lucas: Who's the other drink for?
Copper: She's coming soon! She's still outside. Finn, you know Maeve right?
Finn: [screaming] Maeve is here?!
Lucas: Who's Maeve?

Characters:
Lucas (♂) : Arbrool (red)
Finn (♂) : Axaqueue (blue)
Copper (♂) : Stodoc (purple)

Lore:
Axaqueues: blue creatures
Arbrools: red creatures
Etrikits: yellow creatures
Stodocs: purple creatures
Zelonams: Lucas's original species
Ripple: Finn's village
Atlas: the city they're going to