Homeostasis

Homeostasis is a digital lifeform, and one of the host computers who rules over the Digital World on a Server of the Network.

Physical Appearance
Due to being an incorporeal entity that watches over the Digital World, Homeostasis has no appearance comprehensible to humans. However, when possessing a human medium to communicate with others, the possessed human's eyes often change color to a blurred, glowing rainbow pattern.

Outside of the change in eye color when it possesses a human medium, it appears as rays of light.

Personality
Due its preoccupation with preserving the balance in the Digital World, Homeostasis is driven, intelligent, and sometimes ruthless entity. Its ultimate concern is with upholding order and is not concerned with the individual relationships that humans have with each other or their Digimon if such connections threaten to destabilize the worlds.

Due to the rarity of humans who can channel its consciousness, it tends to speak frankly and efficiently. Though it is known to speak in prophecy or poetic diction, as seen with its dialogue during Maki Himekawa and Daigo Nishijima's final battle with the Dark Masters.

Digimon Adventure
In The Ultimate Clash,

Digimon Adventure tri.
In Confession,

In Loss,

In Coexistence,

Trivia

 * It possesses Maki Himekawa's body on flashback in Digimon Adventure tri. before Digimon Adventure.
 * It possesses Kari Kamiya's body three times.