— SDN (En)

Unlike the female dismantling drones, his legs look quite human and are firmly planted on the ground. His silver hair is parted on the left. En's eyes are yellow, and his head sports a black indicator with five yellow sensors that indicate the status of the drone's five vision systems. His limbs are partially covered in black and yellow warning tape.

In combat mode, killer drones are distinguished by their grinning teeth, sharp metal wings and claws, and their eyes replaced by a large neon yellow cross.
En wears a dark gray coat with a fur collar and a yellow armband with a skull painted on it, the logo of the drone dismantlers. He also wears a black pilot's cap, suggesting he has or has had experience piloting aircraft.

En is the only good drone dismantler. He's nice and honest. Sometimes he can get really embarrassed, which looks even more
...more alive?
Despite the harsh conditions, he maintains a sense of humor. Sometimes he replies, "I'm for any movement!" The most important thing for him is to know that his allies are comfortable.

To put it simply, he's like a golden retriever—very clingy. If he screws up badly, he'll feel incredibly guilty. And he'll keep apologizing until his systems shut down.

— Vi is a friend. A Dronsha-dismantler. She often makes fun of him and can humorously shift the blame onto him (without any real anger).
— Jay is the former leader of V and En. When En betrayed her, she harbors a grudge (against V, En, and Uzi).
"Uzi is a friend. The drone is working." Despite her sarcasm, they became friends.
— Ted is a "bro," and a good guy. Ann doesn't mind calling him "bro," too.
— Tessa was En's former mistress when he was a drone worker at Elliot Manor. He misses her very much (since she was killed at the bloodbath when Sin staged her "revenge").
— Sin, in En's opinion, is the most disgusting. He hated her especially strongly when she donned Tessa's skin, calling herself Tessin/Sintessa. Back when Sin was just a broken drone worker at the Elliot estate (calling En "brother"), they were friends and inseparable.

• Lizzie, Rebecca, Darren and the rest of Uzi's classmates are just friends.
  "Khan is Uzi's father. He treated En like a distrustful person. But then they became friends."
  Nori is Uzi's mother. She was suspicious of En, but when she learned En and Uzi were friends, she softened.
  "Louise Elliot and her husband are dead. But Louise treated En and Tessa's drone "friends" with disdain. And asked to be thrown back in the dump."