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ainara likes mercury... a lot.
she loves hanging out with him and having intimate experiences together. she likes to talk about his interests & hobbies. she loves his daughter too, and she is always willing to babysit when mercury is busy.
Jericho was originally dumped on Mercury as a way of ensuring he didn't pose a threat to anyone. Over time, Mercury has grown close to his skull-faced friend, and he strives to help Jericho live normally.
Mercury is Jericho's best friend and a bit of a guide in the world of social norms. Their astronaut-alien relationship may have had a rough start, but Jericho now delivers tons of affection to his friend.
Valentina is Mercury's only child and perhaps the only thing he puts before his personal aspirations. She's extremely important to him, and he does his best to care for her.
Mercury is Valentina's father. She doesn't know much about the world, but she does know that she loves her dad and he provides things that make her happy.