Omori

as he is a silent protagonist. However, it is implied that he is quite melancholic, as his narration sometimes has gloomy inputs, the overall tone left by the summary, and his final battle dialogue is directly talking down to SUNNY. His abilities are also reflective of this gloominess, being either violent in nature or simply gaining the SAD emotion, or having an advantage while SAD. However, it can be speculated that this is moreso reflective of SUNNY's emotional state, as OMORI is a character built from SUNNY'S conscience in WHITE SPACE and HEADSPACE