- Sandaion, the Timelord
- Sangan
- Sasuke Samurai
- Satellite Cannon
- Science Soldier
- Scrap Golem
- Scrap Hunter
- Scrap Recycler
- Scrap Searcher
- Scrap Shark
- Search Striker
- Second Goblin
- Sephylon, the Ultimate Timelord
- Serpent Night Dragon
- Seven Kid Goats
- Seven-Armed Fiend
- Shadow Ghoul
- Shadow Tamer
- Shark Stickers
- Shell Knight
- Shield Warrior
- Shield Wing
- Shield Worm
- Shinato, King of a Higher Plane