Other Fourth Kinds

=== Paper Man ===
A fourth kind being treated by DS Labs. His body was apparently turned white and shredded. T-san's Hah! seems to have killed him, as evidenced by Kasumi's funerary gifts.
=== Sunflower Man ===
A man who seems to have developed into a strange combination of sunflower and human.
=== Inkfinger Man ===
A man who possesses the ability to generate living ink from his fingernails, and control it to write on surfaces.
=== Falling Man ===
A fourth kind held by Runa Urumi at the Farm. When seen, he entices others to fall with him, possibly to their deaths. He was killed by Torchlight in File 12.
=== Number Five ===
A fourth kind held by Runa Urumi at the Farm. He is pure black with vertical eyes, constantly screaming nonsense, and is noted to "kill too often". He was killed by Torchlight in File 12.
=== Portal-Making Fourth Kind ===
A fourth kind held by Runa Urumi at the Farm. He possesses the ability to create gates, including ones that pass between points on the Surface. He was killed by Satsuki Uruma in File 11.