Not much can be said about OMORI's personality, as he is a silent protagonist. However, it is implied that he is quite melancholic, as his narration sometimes has gloomy inputs 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 SAD 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.

OMORI is 12 years old, therefore his voice should have a youthful tone while still remaining deadpan. His unemotional line delivery should clash with his young voice.

His REAL WORLD counterpart is SUNNY.

OMORI has a reserved tone of voice. He should not sound like he is whispering or have an ASMR tone.