Thunderbird (サンダーバード, Sandaabaado) is a demon in the series.
The Thunderbird is a legendary creature found in Native American folklore. It's considered a "supernatural" bird of power and strength. It is especially important, and richly depicted, in the art, songs and oral histories of many Pacific Northwest Coast cultures, and is found in various forms among the peoples of the American Southwest and Great Plains. Thunderbirds were major components of the Southeastern Ceremonial Complex of American prehistory. The Thunderbird's name comes from the common belief that the beating of its enormous wings causes thunder and stirs the wind.
"A legendary bird of Native American lore. They are said to live high in the mountains. Their flapping wings cause winds, their claps cause thunder, and their eyes shoot light. It is said they can carry the ocean on their backs and eat whales whole."
—Shin Megami Tensei: Strange Journey Compendium
Shin Megami Tensei IV Apocalypse
"A legendary bird found in Native American lore. Thunderbirds are said to live high in the mountains. Their flapping wings cause winds, their claps cause thunder, and their eyes shoot light. It is said they can carry the ocean on their backs and eat whales whole."
—Shin Megami Tensei IV Apocalypse compendium
Thunderbird can teach Nanashi the Mazionga, Taunt and Ziodyne skills through its Demon Whisper. It receives a bonus to Electricity skills learned.
Devil Summoner: Soul Hackers
If Thunderbird's loyalty is maxed out, it can be converted through Mystic Change into the Raijin Sword, a blade that can inflict shock on enemies.
DemiKids Light & Dark
"Big, strange bird with wings of lightning. Believed to bring happiness to its master."