The leader of the Rats in The Witcher is Giselher.
In Netflix’s The Witcher season 3, he stands out as the gang’s organizer and the person most clearly in charge, especially once Ciri becomes tied to the group.

You usually see the Rats as a chaotic gang, yet their dynamic has a clear center.
Giselher, played by Ben Radcliffe, gives the group shape, direction, and identity in The Witcher season 3.
The Short Answer

Giselher leads the Rats in both the broader Witcher story and Netflix’s adaptation.
He pulls the others together, and Ben Radcliffe’s portrayal in season 3 makes that role easy to spot.
Why Giselher Is The Leader
Giselher is usually the most strategic and composed member of the group, so the others defer to him.
Descriptions of the gang present him as the charismatic ringleader, while the rest of the Rats act as a reckless crew built around his direction.
Leadership Inside The Rats
The Rats do not form a formal army, so leadership comes from influence, not rules.
Giselher leads because he has the strongest sense of direction, the most social authority, and the clearest ability to hold together a group made up of damaged, suspicious, violent young outcasts.
How Ciri Connects To The Rats

Ciri’s connection to the Rats grows out of her runaway path and the protection she finds among other outsiders.
In both the books and Netflix’s version, her bond to the gang becomes one of the most important turns in her story.
From Time Of Contempt To Netflix
In Time of Contempt, the Rats enter Ciri’s story as a gang of thieves and survivors, and Netflix adapts that same broad idea in season 3.
Ciri joins the group at the end of The Witcher season 3 under the name Falka.
Why Ciri Takes The Name Falka
Ciri takes the name Falka to separate herself from the life she has lost.
The name connects her to a violent rebel from her visions and gives her a harder, more dangerous identity as she tries to survive.
How Mistle Changes Ciri’s Arc
Mistle changes Ciri’s story by giving her a personal bond inside the gang.
That relationship pushes Ciri further into the Rats’ world and away from the sheltered life she once knew.
The Core Members Around Giselher

Giselher leads, but the Rats work because each member brings a different edge to the group.
Their personalities are shaped by fear, loss, and survival, which gives the gang its volatile energy.
Mistle, Iskra, And Asse
Mistle becomes central to Ciri’s life.
Iskra and Asse help round out the gang’s mix of toughness and loyalty, giving Giselher a crew that feels rough, unstable, and tightly bonded by shared danger.
Kayleigh And Reef
Kayleigh and Reef add more of the gang’s street-level violence and unpredictability.
Reef is tied to the group’s deserter background, while Kayleigh brings impulsive aggression that fits the Rats’ restless style.
Their Shared Trauma
The Rats bond over what Nilfgaard has taken from them.
Their stories trace through ruined homes, military collapse, and life on the margins, so their loyalty to one another grows out of survival more than trust.
Why The Rats’ Leadership Matters

Giselher’s role matters because the Rats shape Ciri’s moral descent and emotional isolation.
Once he leads the gang, it becomes more than a group of thieves and turns into the space where Ciri’s darker turn begins.
Giselher’s Influence On The Group’s Violence
Giselher helps give the Rats their momentum, and that momentum feeds their brutality.
The gang’s violence grows from their confidence, their resentment, and the way Giselher keeps them moving as a unit.
The Threat Of Leo Bonhart
The Rats’ leadership sets up their collision with Leo Bonhart, the bounty hunter who becomes one of their deadliest enemies.
Bonhart is a far greater predator than the gang expects, and that imbalance turns their swagger into tragedy.
Why The Name Rat King Can Be Confusing
“Rat King” sounds like a title for the leader of the Rats. Many people confuse this phrase with a different idea of authority.
In The Witcher context, Giselher actually leads the gang. The term “rat king” serves as a symbolic or generic label rather than a proper name for him.