“Favorite regular enemy in any video game”
A lot of games have rather iconic regular enemies, often the weakest enemy in the game. The Goomba, Waddle Dee, Metaur (or however a particular game spells it), etc.
But my favorite is none other than the first enemy I ever faced in an RPG:
The Slime from Dragon Quest. These blue Hershey’s Kiss-shaped “monsters” might be most famous for low-level experience grinding, but they’ve gone on to be recruitable party members (with names like Gootrude and Goober) and star in their own spinoff games (Rocket Slime).