The 46th spirit of the Goetia and an Earl of Hell. He first appears as a monster but after a while he will take the shape of a man at the command of the summoner. His office is to teach men astrology, geometry, and other arts and sciences. He also will teach men the uses of herbs, about precious gems, and different types of wood. Upon the command of his summoner, he will also move a buried body to another location or light candles upon the graves of the deceased that he has control over. Bifrons controls over 26 legions of infernal spirits.
Bifrons is also an alternate name for Janus, the Roman two-headed and double-natured god of gateways and new beginnings.
"One of the 72 demons of the Goetia. He lights candles on graves. He only appears in human form when ordered to; at all other times he is a hideous monster. He has much knowledge, and teaches about magic, herbs and gems. It is said he also has the ability to control the souls of the dead."
—Shin Megami Tensei: Strange Journey Compendium
Bifrons (or possibly multiple Bifrons) serve as Master Mitra's main messengers and runners. A Bifrons was also tormenting Bugaboo when the protagonist and Jimenez stumbled upon them.
"One of the 72 demons of the Goetia. He lights candles on graves. He only appears in human form when ordered to; at all other times he is a hideous monster. He has a great deal of knowledge and teaches about magic, herbs, and gems. It is said he also has the ability to control the souls of the dead."
—Devil Survivor 2 Compendium
Bifrons is one of the minions of the Anguished One. He first appears on the fourth day asking his master if he can kill the humans. He can be optionally fought on the 5th Day when it tries to sabotage the Tsuutenkaku. If the player does not defeat him and is not on the Anguished One's route, Bifrons reappears on the Last Day when the Anguished One decides to test the player's strength. Bifrons stands out in comparison to Botis, the Anguished One's other minion, as a sadistic demon who enjoys killing for its own sake. Only kept under control by his master's threats. Bifrons is unlocked for fusion after his defeat.
This is event mirrored in DemiKids: Dark Version as Bifronz attacks Akira in the Dark Temple after he reads Darklord's letter. Bifronz attacks Akira to prevent him from attaining the power of dark, believing that the power belongs to Imperius.