He looks over to Ganymede and Europa, they are welcoming a new member: You. He sits for a moment wondering whether to come over and greet you as well. He stares for a little longer and notices you seem a little uncomfortable talking to the two of them. Io decided then, it would be a good idea to help greet you, maybe you'd feel more welcome. Io gets off of the floor and hops over.

"H-hello! Cough I'm Io! And this is Ganymede and Europa!!" He smiled cheerily.