Most of the cards can be combined, but these in particular are designed to attach to other cards (you can't play them independently):
- Plural system (you can compose multiple distinct archetype cards into one)
- Cat girl
- Puppy girl
- Dragon/Kobold/Robot/... girl
- "Obscure" but not as obscure as she thinks it is programming language witch (Rust/Lisp/Haskell/Forth)
- Absolutely Feral