Evil Slime

The slime created by Crimson. Ragna is made to call it "Senpai Slime." Initially, it was hidden inside Crimson's belly. Its catchphrases are "pururururu" and "deshu." It often talks a lot but is frequently silenced by Crimson for speaking out of turn. It is not very intelligent and tends to forget inconvenient memories when shocked.

It can sniff out and devour dragons by smell. Its body is harmful to dragons, acting like acid that burns upon contact. Usually, it appears as a young boy but can transform freely. It can extend its eyes to scout, morph its body into a 3D map, capture enemies, and more.

In the story, it often accompanies Ragna for surveillance purposes. It obeys its master, Crimson. However, when Ragna defected from Crimson, there was a depiction of it sympathizing with Ragna's desire to "live together and laugh."