This is Castle the Unstoppable.
He is the only boy of the group, although not as brave as Rook, he is the fastest runner, climber, playful, an all round active kitten.

He is used to human, but will speed off to hide if surprised

He is one of a litter of 3 that I fostered.

Originally belongs to my neighbor, but the mother cat moved the kittens over to my house after having her nest constantly disturb by children.
The neighbor doesn't want them back.

I already have an adult tomcat that is unfriendly toward the litter.