- "You can't just manipulate people to do whatever the hell you want!"
- —Heat O'Brien, Digital Devil Saga: Avatar Tuner 2
Heat O'Brien is the human upon which the AI Heat was based on.
O'Brien looks visually identical to the AI bearing his name, except for his wardrobe and his hair. Also, the human Heat was somewhat blond, while the AI had bright red hair.
As hot-headed as his AI counterpart, he would often make angry outbursts at how Sera was being treated, and openly expressed his disgust of the manipulative behavior of his coworker Serph Sheffield. This caused Sera to regard him as a scary big brother, as she never saw the side of him that cared for her.
The AI Heat is based upon the hotheaded, angry side of Heat O'Brien that Sera regarded with fear. Like Heat O'Brien, the AI Heat comes to care for Sera deeply, though he is unsure exactly how he feels about her, reflecting Sera's own confusion of their relationship, and can only express himself with anger and force.
Digital Devil Saga: Avatar Tuner 2 Edit
Heat O'Brien is a graduate of Berkeley College as a gene therapy doctor, who joined the Karma Society's God Project and was placed in charge of Sera's physical condition. His little sister died of the Cuvier Syndrome, and he came to care for Sera as a replacement sister, giving her a black cat named Schröedinger as a present.
While Sera was being put through a painful and particularly damaging experiment which he believed she had little chance of surviving, Heat finally snapped and pulled a gun on Serph, ordering him to stop the experiment for Sera's well-being. However, he was shot in the back by Argilla's human counterpart and died. One of the scientists accidentally engaged a live feed of the control chamber into the test chamber where Sera performed, allowing her to watch as Heat died.
As a result of the horrific revelation, Sera inadvertently poured enormous amounts of corrupt data into her communication with God, maddening the entity with pain, causing the Black Sun incident.
His Solar Data was preserved, and collaborated with his spiritual successor, the AI bearing his name, and Serph, the AI version of the maniacal Sheffield, to destroy the remnants of the Solar Data of the lunatic and of a fake version of the AI originally used in the Junkyard. Following this, he finally died for good.
True Heat as Agni acts as the temporary party member alongside Serph against Real Varna and Fake Varna. Because the enemies are pathetically weak and True Heat's skill repertoire is well geared, players can simply pass Serph's turn for True Heat and let him handle the rest. He can neither participate in or initiate any combo skills nor revert to human form from Agni.
|Playable (Avatars)||Serph (Varna) - Argilla (Prithivi) - Gale (Vayu) - Cielo (Dyaus) - Roland (Indra) - Sera (Varnani) - Heat (Agni) - Seraph (Ardha)|
|Non-Playable||Jenna Angel - Margot Cuvier - Fred - Adil - Schrödinger - Serph Sheffield - Heat O'Brien - Argilla - David Gale - Colonel Beck - Meganada - Brahman|
|Nirvana||Underground City - Internment Facility - Karma Society Tower - EGG Installation - Power Plant - Airport - HAARP Facility - Sun|
|Songs||"Alive" - "Time Capsule"|
|Terminology||Atma - Berserk Mode - Black Sun - Cuvier Syndrome - Karma Society - Lokapala - Tribhvana|
|Lists||Demons - Bosses - Mantra - Skills (Combos) - Items|