I feel like Selendis without adepts would be a crime, since they literally scream out “For selendis!” when they start combat.
Maybe even a melee version with a sword or something to replace zealots, since the animation would work fine in melee with a weapon instead of a cannon on the arm. Given her lore as like, breaking the glass ceiling for Templar, it might be cool to give her female versions of a couple normal units like High Templar and Zealots in the same way ghosts have different gender versions, but I think it’s not super hard to do something with her fantasy in general.
She’s High Executor of the Templar, Artanis’ military commander, the one who commands the Golden Armada, etc. A powerful fleet as the core of her commander identity and maybe some Akundelar-style ground units that hold the line until the fleet gets there would work pretty well