stay gold clan (umamusume)
A group of horse girls in Umamusume based in real life consisting of Stay Gold and her RL progeny. Due to Stay Gold's latecoming, she can be replaced by Kin'iro Ryotei or an OC.
The tag should be used only if at least all Progenies that were accessible at the time of the making of the picture are the focus of it. Again, Stay Gold herself is a late arrival and the picture might focus specifically on her progeny, so she's optional. Progenies of progenies are also optional (and currently limited to a single character).
Notoriously known by the Japanese horse racing fanbase for their "quirky personalities" as their IRL counterparts are... Strange at best.