Teppo

A program that Hikari created in order to investigate Saki and Finnel's mutliple personae issues.
Teppo is an acronym for his real name, Trans Encoder & Personable Program Optimizer.
You see him by installing him as a plug-in. When Aoto Dives into them, Teppo keeps him company. Teppo is capable of detecting cracks in their minds and repairing them.