A little explanation about variant (Patreon)
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(TL;DR) I hear you and I'll make a Miranda variant! Diana or Tali model don't exist in Blender so I can't, as for Jack, you need to read below. (I'm surprised about Jack popularity here! o_o)
First, thanks for your comment! I see you loved the animation, I wasn't sure ^^'
Okay so let's explain a bit about character variant.
We can move a model with a Rig and Bones. But most of the time, Rig and Bones' names is never really the same. So if I want to make a variant, I need to redo the animation from scratch.
But with Rigid3D model, Rig & bones are the same. That's why I can "copy/paste" animation for Liara, Ashley, Miranda, and I'm quite sure I can do it for Ada, Claire and Jill too.
After copy/paste, the animation isn't perfectly match tho, I need to tweak some keyframe, positions, hair, physics (because model doesn't have the same bodyshape) .. but the core of the animation is here, so I gain a LOT OF time.
That's why, sometimes, I can do variant (All rigid3D models, and probably a lot of Niodreth Models), but can't for everyone like Jack because it's an Icedev model and he doesn't use the same rig at all.
Hope Its helps for understanding variant =)