Raiho is a Jack Frost who has fused himself with a basho uniform. He previously idolized Raidou Kuzunoha the XIV and had hoped to become Raidou Kuzunoha the XV. After his fusion with the uniform, he decides that Raidou is too small of a title, and that he will be known as Raiho Kuzunoha. If Raidou mistakenly calls him Raihee, then the enraged Raiho attacks him. Defeating Raiho will allow Raidou to summon him. Raiho only appears during a new cycle.
Raiho appears in the sequel, again as an optional boss. This time, he can be challenged on the first cycle in the case file "Ghost Customer." Upon defeating him, Raidou will be able to fuse a Raiho of their own at level 40, and will be allowed to ride the streetcar for free. Raiho learns the Glacial Blast ability, which has the potential to be one of the most powerful spells in the game. During the battle he summons a Pyro Jack, Makami, Moh Shuuvu, Mokoi, Jack Frost, Pixie and finally a Mahakala, which is his most powerful demon.
A Raiho design is on the eyepatch of the playable, older male Buccaneer in Etrian Odyssey III.
Raiho's optional boss battle in King Abaddon is a case of breaking the fourth wall.
In the English version of the PSP remake of Persona, the mentioned Jack Frost is named Raiho as the Jack Frost that appears in the Raidou games. However, in the Japanese version of both the original and the remake of Persona, the Jack Frost is actually named Hee-ho-kun, a Jack Frost that wears a school uniform that appears in Shin Megami Tensei: if....