I know there's like... cake matter, party matter, etc, but is there an actual plain Darkmatter minion? I was hoping I could "view uncollected" in my minions like you can with beanbags/plushies but no luck.

Also, does anyone know of a complete minion listing anywhere? Or semi-complete?

Hello

SubetaLodge has a list of Minions if it's help. ^-^

The list shows all minions with matter in the name. It's sorted alphabetical. I also wished we have the option to show uncollected miniosn like the achievement list for plushies, beanbags, pumpkins or the pet-only list with unread and non-eaten food.

For a full list, the best bet is the Hearthstone Wiki Battlegrounds minion geometry dash page, which is the closest thing to a complete catalog.