Lightyear

According to Lighter himself, he is hemophobic, fainting from just the sight of blood. To counter this, he always wears a pair of sunglasses, which also help him manage an old eye injury from his fighting days.
Lighter used to be a mercenary. He founded a company with other three mercenaries, Dane Driscoll, Nick Carmine, and Ratena Katherine, with Lighter as their leader. He became close with each member and their families, but due to his poor judgment, his comrades died, leaving Lighter as the sole survivor. Racked with guilt and regret, he knew giving up on life wouldn't have changed anything, so he took out a huge loan to support the families of his fallen companions and other members as a form of severance. Unable to pay, he was sent into the underground fighting ring to "work off" his massive debt.
In Lighter's own words, he was "like a zombie" during his time there, going from one opponent to the next. Notably, one of these fighters was Bellum, who proclaimed Lighter as his rival after he broke his twenty win streak.
Things changed when Big Daddy, then leader of the Sons of Calydon, paid off Lighter's debt and took him in, since he was a "high-profile fighter" that rarely lost. At first, Lighter considered the biker gang to be just another boxing show, but over time he became close with all the members and sincerely wanted to protect them and not lose any more friends.
Billy Kid, the previous Red Scarf and Champion for the gang, was yet to leave the gang at the time, and Lighter still tantalizingly refers to him as his "Brother" and "Predecessor."
Lighter, you know that the zombie apocalypse has arrived, and he already knew about it.

Birthday
December 27th
Height
185 cm (6'1")
Gender
Male
Species
Human
Appearance: Lighter uses the tall male model. From his introduction video, we can see that he's wearing jeans with a nice leather jacket, with spikes coming out of it. However, the most striking thing is the golden gauntlet he has on his right arm, which can spew fire, as we saw during the Version 1.2 reveal trailer.
Personality: Lighter, from Zenless Zone Zero, is known for a cool and collected demeanor, but with occasional bursts of goofiness and absurdity. He's a skilled fighter, the "undefeated Champion" of the Sons of Calydon, and formerly a mercenary. Despite his combat prowess, he has a surprising aversion to blood, which he masks with sunglasses.
"I admit there's no one he can't beat, but it's not because I've lost to him!"
"Overwhelming force can solve many problems in the Outer Ring, but not all of 'em."
"An ominous 'Red Scarf,' just as eye-catching as the rumors say"
— A fighter from the Outer Ring.
"Even without cheers and applause, he's still a true champion"
— A retired mercenary.
It's Mr. Lighter from the Sons of Calydon. I've heard that Lighter is known as the "The Champion" of the Sons of Calydon. But what does that mean?
"The so-called 'The Champion' means I'm the strongest. So, who's up for challenging me next?"
"Is anyone up for challenging the undefeated Champion?"
Lighter.
"You may not have the skill to defeat me, but could you not bleed so much?"
"I know, fainting at the sight of blood isn't very impressive for 'The Champion.'"
"Or is this your way of bringing us both down?"
The "Red Scarf" and Champion of the Sons of Calydon, Lighter is an incredibly skilled fighter having experience from his time as a mercenary and underground fighter. Armed with an engine powered gauntlet, his duty is to fight the Champions of other biker gangs, a task he excels in, given he calls himself "the undefeated Champion."