Hypnodon is a hypnotic Psymonster who is completely serious and repetitive about making any Psymonsters hypnotized. She memorizes every hypnosis book in the library, subscribes to several hypnosis magazines, and has a graduate degree in the university of the Psymonster World. Her philosophy is that if any Psymonster isn't being hypnotized, she is not doing her job right. The way that Hypnodon sees it, she may have only one eye, but she has a unique power to hypnotize any Psymonster through eye contact and make other Psymonsters follow her commands. One of the most illustrious and superlative Psymonsters is counting on her to uphold her definitive traditions of hypnosis, and she doesn't want to let any Psymonsters down. That is why she practices so hard to have the most knowledgeable, quick-witted, and conversant Psymonsters around. Furthermore, it lets her hypnotize any Psymonsters.
She is a purple hypnotic starfish with a lilac hat, mitts, and slippers, and she only has one hypnotic eye.
- Hypnodon is one of the eight Psymonsters who have one eye (the other seven are Helmodon, Sinclops, Exodus, Fuzukeen, Deceased, Headphonical, and Quartz).
- Hypnodon is the only female Psymonster with one eye.