Cactus Guy is a character that appears in the episode "Angel Face", making a brief appearance in BMO's expedition in the desert. He is shown waving to BMO, and BMO tosses him a Special Sentient Sandwich.
Cactus Guy is shown to look like an average cactus, having dark, lime coloured skin and a simple face with dotted eyes. He has normal cactus spines.
- Cactus Guy could possibly have some friendship with BMO, as BMO refers to him as "My friend, Cactus Guy".