Are you asking for ideas for what kinds of monsters we would like to see?
Because if that's the case:
1. Expanding the number of Daedra you can encounter
2. Wraiths and Banshees or something similar (Wispmothers are far too infrequent)
3. Falmer and Chaurus outside of their pits/dens at night.
4. I'd personally like more occasions for dragons to try and double team you.
5. Ghosts you can't harm with non-silver/daedric/bound weapons.
6. Wendigos (in the Reach perhaps?)
7. A colony of horrible rat people (I ask for this a lot because of Invader Zim)
8. Sea serpents (possibly a Leviathan?) in the Sea of Ghosts.
9. Sharks in the Sea of Ghosts as well.
10. Non-Draugr zombies and undead