Best unit for the price.

I would like to know which units were your favorites or most memorable in each installment of the Heroes series. If you haven't played a particular installment, just put a dash. If it's incredibly difficult to choose, name two. Here's an example: 1. — 2. Medusa from the neutral creatures. 3. Fanatic from Fortress and Manticore from Dungeon. 4. Slime (I don't remember the exact name, but the unit is memorable) from Necropolis. 5. Witch from Dungeon. 6. Yuki-Onna from Sanctuary and Broodmother from Inferno (I didn't really like Broodmother, but it's very memorable). 7. Dragon of Light from the neutral creatures. Think carefully, because each unit is interesting and memorable.