I found a and I'm wondering if there are any more Rift-themed minions, since I have a Riftborn pet. Are there any more?

I don't know anymore offhand but if you look at [link=https://www.subetalodge.org/list_minion/rlow/1/rhigh/199/excludeub/true/name/rift]Subetalodge[/link] there's a handful of them!