This man hasn't have any spotlight time or a character arc. So here we go XD.

Spinner has always kept to himself most of the time, though the lizard of course doesn't let anyone into his private life. He was mostly worried that the others would try to get involved into his private life.

Thing is spinner does have a  myth and a dollfox he just kept both a secret. Why? Well because he is part of a test, and he only had gained his doll fox through that test. His dollfox, was like the twins(psycho and gazer) in a way, the dollfox was engineered/trained to attack when ordered, to speak when told to speak, To kill when told to kill.

His myth is part of this too, he was given a type of serum that allowed him to earn his myth. This serum was meant to help, those who never got a myth to get one. Of course this was found out by, the place watching and observing espers and others that has mythical forms.

His myth form, is not under his control really, as the creature isn't to thrill of being part of this test. Neither were, but given the circumstances both got lucky with each other.

Spinner, didn't want to but he figured it will help, money wise for the league. Which it has, even if some asked him where he was getting it from, he just came up with an excuse saying he robbed a few rich people.

As for his dollfox, he has kept him in his doll whenever he's around the league and keep it in his scarf.

Though no doubt sooner or later, he will need to figure a way out on how to help the fox and his myth. Since both keeps coming back, more obedient and less well talkative. He doesn't know what it was that they were trying to accomplish, but he knows it can't be good either way.

Again, he doesn't need the others to get involved, so he has been working silently on an idea on how to get the two free. Though it'll be tough, if he were to try anything, as even free his dollfox both will be terminated.

Dollfox: Ambrose
He is a ghost type mixed with a bit of dragon dna

Myth form: a sea beast named Ajani

(I just came up with this on the spot and I like it so far may tweak it later idk)

Blitz_Dragon