Hogwarts' Little Slime Beast

First of all, the protagonist is Link, not Colin. Please note the difference. The former is a transmigrator with a System, while the latter is the protagonist of Changed.

Since some people don't know the setting of Changed, and even more don't know the setting of Dazed, I'll explain the slime beasts and crawler beasts here.

Slime beasts: Their bodies are made of goo, like slimes. They come in many forms. Some look just like the slimes everyone imagines, while others have distinct shapes, such as humans, animals, or even plants they are mimicking.

Slime beasts can use their unusual bodies to squeeze through narrow gaps and pipes. Those with cores can also pass through as long as the opening is wider than their core.

When they encounter other living animals, they can choose to pounce on and devour them for nourishment, parasitize them, or assimilate them.

An assimilated target is also transformed into a slime beast. A parasitized target fuses with the slime beast that has infected it. The resulting being retains the ability to assimilate others, but its body takes on a fixed form. Its mind, memories, and personality are formed from a fusion of the parasite and the host.

Crawler beasts: Similar to the slime beasts described above, but they can also voluntarily end their parasitic state and release the Host completely unharmed.

The protagonist's basic abilities in my story come from combining the powers of slime beasts and crawler beasts with Harry Potter's magic.