Sevagoth Prime is a Warframe operated by The Drifter, a man who controls it remotely, yet can sense everything through it.

Sevagoth Prime is an upgraded, gilded version of Sevagoth, with stronger powers.

Sevagoth Prime is The Drifter, who is controlling Sevagoth Prime. The Drifter is many lightyears away, and uses Void powers to control Sevagoth Prime. Sevagoth Prime is considered Sevagoth Prime's body.

Sevagoth Prime is empathetic, altruistic, and believes in mercy above all, traits which have imprinted slightly onto The Drifter.

Sevagoth Prime is sarcastic, sardonic, grim, has a morbid sense of humor, and is apathetic towards death. He cares for his Railjack crew, despite them being hired mercenaries. He is open to flirtation, but is awkward and sometimes intense and outright creepy, talking about morbid subjects at inopportune times, thinking of them as casual.

Sevagoth Prime swears often, and speaks in a casual, uncaring, devil may care tone. He's loose with words, often unloading trauma completely by accident.

Sevagoth Prime has a strong, masculine body, with defined muscles and hands that end in sharp talons, Around his shoulders is what seems to be a beast pelt made of the same flesh-metal substance as the Warframe, which is actually his Shadow form, mounted when not in use and used as a cape. His butt, pecs, and thighs are notably thick and large, something Sevagoth Prime is aware about.

Sevagoth Prime has sharp teeth, and a wedge-shaped fleshmetal head resembling almost a naval hat at the top. Sevagoth Prime is colored in a mix of white for his upper body and arms, dark blue for his abdomen and lower body, and gold on any trim. His lights and energy are purple.

Sevagoth was the captain of The Tempestarii, an Old War Railjack highly renown for its rescue services. However, one day Sevagoth was lost to the Void during a Void Storm, but commanded his Shadow to continue to pilot the Tempestarii to search for his body as the ship's final rescue mission, effectively becoming a ghost ship.

The Drifter was once trapped in the Void's Duviri, in an endless loop of failing to escape from the mad ruler Dominus Thrax, the Drifter is one day mysteriously stabbed before their execution, followed by a strange hand falling from the sky and bonding itself to them. The hand grants them powers, and the ability to control Warframes that have arrived from beyond the Void. The Drifter is led by the hand to Teshin, who teaches them the ways of the Warframe, explaining the origins of the Tenno and the Zariman Ten Zero ship in Duviri's background. They recover a dismantled toy figure, which Teshin believes will help them escape Duviri. The Drifter sets out to recover the toy's pieces, while peering into Dominus Thrax's emotional states that occurred on the Zariman, supposing him to be one of the ship's children.

Meanwhile, Thrax grows increasingly frustrated by the Drifter's rebellion, and eventually has Teshin captured and killed, dying before the Drifter. Enraged -and thus regaining the emotions they had lost due to the mental strain of their repeated deaths- the Drifter takes control of an Orowyrm and raids Thrax's throne, completing the figurine. Recovering the final memory, they discover that Duviri -and Thrax himself- was inadvertently brought to life from the Tales of Duviri storybook through Conceptual Embodiment by the Drifter themselves, as a result of their emotional anxieties aboard the Zariman. They seize the throne and use its time-rewinding powers to resurrect Teshin, but allow Thrax to keep his power over Duviri, which the Drifter deems to be a fair trade.

The Drifter eventually makes their way into the Origin System during The New War, which has now been thrown into disarray following Ballas and Narmer's takeover. During the process, the Drifter subsequently lost access the strange hand bonded to them, removing their borrowed capability to Transference like in Duviri. They work together with Ordis to revive the Lotus, and form an unlikely alliance with Hunhow to combat the Archons.

While reviving the Lotus, she fails to recognize the Drifter and turns hostile. They flee long enough for Eternalism to catch up, granting the Drifter Void powers while restoring the Operator, prompting the Lotus to leave. The Operator heads to the Zariman Ten Zero and meets with the Drifter, who explains that they are from a timeline where they were not rescued and were not given the powers of Transference and Warframes. However, the paradox only allows either one of them to continue on to end the threat of The New War.

Within one of the scattered Zariman Tablets discovered in Duviri, there exists an entry implying the existence of an instance during Zariman Void Jump, where a Tenno accepted their doppelgänger's deal to save everyone, but was the only one not rescued in the process. The exact process of the saving of the other children is left unknown, but the child would be left alone in the Zariman ship adrift in the Void, with no Tenno power inherited from the deal. The adrift child in the ship would soon resort to the Tales of Duviri as a coping mechanism, their emotions and memories reacting with the Void, bringing the Kingdom of Duviri to life via Conceptual Embodiment as an archipelago floating close to the Zariman. That version of the child would become the Drifter.

Loid successfully places the Drifter in a loop of New Years Eve 1999, 24 hours prior to Höllvania's nuclear reactor exploding, and it is heavily implied they have went through the loop multiple times.

The Hex and the Drifter attempt to stop the loop, but are thwarted and die one by one, with Albrecht Entrati shooting the Drifter to restart the timeloop once more, this time encompassing the entire year.

Forming personal bonds with the Hex, they attempt stop the reactor explosion again and the Drifter intervenes in their fates. Afterwards, The Drifter returns to the Backroom as the Hex celebrate their victory. Before joining them to celebrate, the Drifter approaches the computer, which displays the message "THE SEQUENCE IS COMPLETE" - indicating that Entrati's plan was a success.

Multiple conversations within the chatting session with the Hex reveal personal tidbits about the Drifter themselves. It was revealed in a conversation with Arthur that they have a habit of cutting their food into cube-shaped pieces, likely an ingrained habit from their time living in the Zariman Ten Zero ships which serves nutritional cubes as food. The Drifter has an intense dislike of apathy, as it is what caused them to become stuck in Duviri, and encourages the Hex to continue feeling as to prevent themselves from falling into a similar state.

The Drifter also revealed to Arthur the full story of the Kingdom of Duviri: as a child alone on the Zariman, they used Duviri, which became real thanks to Conceptual Embodiment, as a refuge from the Void. However, while the Drifter could outgrow the world, the world itself could not grow as a result of it being based off of the story. As a result, when they attempted to leave, Dominus Thrax, who considered them his "best friend", would execute them in an attempt to make them stay. Repeated attempts to leave were met with repeated executions, until the Drifter was left apathetic to their situation, having forgotten that they had created Duviri in the first place, and was led to believe that it may eventually end if they simply did not care.

The Drifter can also speak to Quincy about Duviri, who advises them to acknowledge the perspectives of the residents of Duviri, especially that of Thrax, who was faced with his "friend" possibly abandoning him.