The boy on the left has a special power. He can become part-Pokemon and use that Pokemon's powers in fighting. He can also disguise himself by turning fully human. But regardless of what state he's in, he's still very vulnerable to that Pokemon's weaknesses (in this case, fire and martial arts). If someone knows what type of Pokemon he is, they can use it against him, and he has no choice but to fight back.

The woman on the right is his mom. He gets his powers from her. Usually, the parent's type will be super-effective against the child's. (Her father is a psychic-type.)

The kid's father doesn't have any special powers. He's an immigrant from Senegal who works for the post office. The family lives in France. (Donc, le garcon est un <<Farfuret>> et sa mere est une <<Chimpenfeu>>. Man, these French names are great!)