Tavo is a male Altean. When Haggar found the place of his colony, she used him and his people for her own good. When Allura talked with him, the entity Haggar used him to get rid of him. And then he decided to help the Voltron Coalition when they fought against Haggar for the last time. And he only hoped that through Romelle's actions, his people could compensate for the worst things.
To be added