"I am the raging god! The king of kings, ruler of all! Kneel before Belberith!"
—Belberith, Devil Survivor
Belberith (ベル・ベリト, Beru-Berito) appears in Shin Megami Tensei: Devil Survivor as the most powerful contender for the King of Bel title. He appears as a boss in Day 7, except on Yuzu's route.
Baal-berith was the god of a Canaanite city who later came to be viewed as a demon by Christian demonologists. In the Book of Judges, his temple was destroyed after the king Abimelech quelled the rising of his subjects. In Rabbinical literature, the idol Baalberith which was worshipped by the Hebrews after the death of Gideon was identical with Baal-zebub and was worshipped in the shape of a fly. The name berith means "covenant".
Belberith is a mismash of several preexisting demons (Baal, Bael, Pabilsag, and Belphegor) fused to a fleshy mass with many spider legs protruding from it.
Belberith is driven by revenge against God. While powerlust is also a part of Belberith's personality, he will gladly forego his own desire for power if it means the new King of Bel will continue his crusade against God.
Belberith is the demon that inherited the biggest part of the original Bel, and as such has Bel's lust for revenge against God. At the time of the game's happenings, he already has absorbed a number of other Bel demons, and has both Jezebel and Belzaboul under his command (even if the latter only obeyed him as part of Lucifer's orders). He is worshiped by the Shomonkai as a god, and their belief in him gives him power.
Belberith appears to be a conglomerate of the existing demons Pabilsag, Baalberith, Belphegor, and Bael. Bael is a Goetic demon that is visually similar to Belberith.