Oh dear, Kal is currently defenseless to Gwenpa shenanigans. Though, knowing him I doubt he would do anything to bother her too much while she is in such a state.
Just need Sakura Chiyono O (Maruzensky's 'son'). And Buena Vista (Maruzensky's other 'great-granddaughter', also Special Week's 'daughter').
Though think those two weren't implemented yet when this art was drawn.
Anyway, if you carefully notice, one of them is based on a RL mare while the rest were stallions. This is actually alluded to in the art and character design.
The eardecs. Or hat/hairdecs in some cases.
... And now we have the entire Daring Tact family tree (sans Daring Heart) to add to the grouping.