No, it is not a bantam. It is either a Black Maran or Black Copper Maran and I wasn't sure if either of these breeds had pink legs? She is the friendliest of all my baby chicks too! I really hope it is a pullet!
Yeah its common in some lines, Ive had it on some ameraucana lines as well. You can see the slate is still there its just not super defined. If you were breeding them I just would use a rooster with the darkest colored legs and work on it, if youre breeding for SOP. If not its no big deal!