Beneficial Pathogen Symptom Idea Dump

[Frank_Stein]

A parasite that eats dead matter and produces water and soap. At low levels you're periodically being cleaned of stains, at higher levels you leave a path of cleanliness in your wake.

A brain fungus causes you to grow a mushroom cap that acts as a protective helmets. Different tiers add an additional effect like providing light or environmental protections.

Echolalia - Causes you to repeat random things you heard. Higher symptoms include sounds like gunshots