LBX Dak Sendou vs Yujin

Nils Richter is one of the antagonists of the first season and one of the protagonists, the first character to test the psychic scanning suit provided by Kamiya, and a former "test subject" of the "Supporters of the New Dawn".
Appearance
Nils has black hair, black eyes, and pale skin. In the first season, he wore a dark purple jumpsuit with purple details. His hair was short and covered one eye.
Personality
In the first season, Nils was cold, his eyes emotionless and lifeless. He was obedient, as if zombified, likely because he was the subject of experiments to develop the Extroller suit.
Robots
Nils only had three robots. Now he has a robot called Judge.
Relationship
Justin Kaido - Nils and Justin are very good friends. During the Artemis Tournament's final battle, when Nils was subjected to a psychic scan from the Extroller Suit, Justin remembered seeing Nils before. This happened in the hospital after the Tokyo Bridge collapsed, killing both boys' parents.
Wan Yamano - One of the enemies in the Artemis Tournament finals
Interesting facts.
The judge is his first robot.
Killian Kaido, who adopted Justin after the boy's parents died in the Tokyo Bridge collapse, along with the "Supporters of the New Dawn" used Nils as a test subject to develop the Extroller Suit.
Nils is a little shy in public.

Appearance
Justin has black hair that's partly white, red eyes, and pale skin. In season one, he wears a white shirt, a gray vest, a black jacket with a purple stripe, brown pants, and black boots.

Personality
Initially, in his first appearance at Van's school (in the episode "Mysterious Student Justin Kaido"), he was withdrawn and unapproachable, but later it turns out that he is quite intelligent, kind, and sociable. In some moments, he is even cunning.

Robots
His first robot was the Emperor, which was later changed to the Emperor mk.2.

Family
His parents died in the Tokyo Bridge collapse.

Nine years ago, in the anime's events, that is, in 2041, the Tokyo Bridge collapsed. Little Justin cried in terror, and journalists tried to reach him. But Minister Kaido put an end to it. He personally took him to the hospital and vowed to become his family.

Facts about Justin Kaido
Justin Kaido joined Van's team in Season 1, Episode 28.
He loves tea and drinks it in a very intelligent manner.
One of the anime girls had a crush on him, but he ignored her.
In the manga, Justin cried when he learned of his grandfather's death.
Justin changes his wardrobe every season (all characters)
Nicknamed "Emperor Instakiller" by Duck Sendou for his super-fast match victories
He qualified for the Artemis Tournament's Royal Rumble thanks to Lex, who gave in to him for his own benefit.

Appearance
Ami's design hasn't changed much, as she still has some elements that remain unchanged, such as her white wool earmuffs and stockings. The most noticeable change is her hair, which has only gotten longer with each season.

Adorable Ami has pale skin and very short lavender hair with bangs. Ami usually wears a triple-layered pink skirt and a soft pink blouse trimmed with white fur except for the bottom and two strands of fur-colored pom-poms at the collar. Ami wears white wool earmuffs with a pink headband, and white stockings with a blue stripe and black Velcro shoes.

Personality
Ami is a smart and level-headed girl. She's excellent at devising battle strategies for Van Yamano and is also a master at controlling robots.

LBX robots
It is known that Ami's combat robot is a Kunoichi.

Appearance
Katsu Walker (Japanese: Kazuya Aoshima) has curly red hair, dark azure eyes, and yellowish-beige skin.

Season 1
In the first season, he wore a blue blazer, a white dress shirt with an open collar and a red tie, a pair of black trousers and black shoes.

Personality
Katsu appears to be a friendly and reserved boy, sometimes lacking self-confidence. Sometimes he acts very quickly and abruptly. For example, he acted this way when he was on the evil side, and it was directed at Justin. Katsu would never allow anyone to harm Van or Ami. It's worth noting that Katsu is a very intelligent and kind boy. He's an excellent tactician. He's well versed in LBX robots and computer technology. Katsu became a fake slave player because he's so proficient with technology and managed to defy the Directors. He's very sociable.

LBX robots
Katsu has had five robots: his first robot was the Trooper, which was destroyed by Gordon's gang, his second was the Pharaoh (who hypnotized him), his third was the Gladiator, which was given to him by Boss Navarro, and his fourth (current) robot is the Hunter.
Interesting facts:
For some reason, Master Otaku rarely addresses Katsu by name. In Season 1, he addressed him informally as "You" and "What's-your-name."
All of Katsu's robots (except for Pharaoh) are of the shooting type.
Katsu is the only character who knew who was behind the Directors and their goals.

Appearance
Wang Yamano has a youthful appearance. He has long, dark brown hair and large eyes. His hair has bangs with a small strand sticking out at the top.

Season 1
Van has curly hair (except for his bangs and ends) with two pairs of eyelashes protruding from the top of his head. Van is dressed in a typical boyish style, wearing blue denim pants with a button pocket mid-thigh and white socks, as depicted in the anime when he was lying on his bed. Van also wears an orange jacket with dark blue trim, a collar (instead of a hood), and a pattern of a heart struck by Cupid's arrow. Van's casual, athletic shoes are red and white sneakers.

Personality
Van Yamano is a very kind, intelligent, level-headed, and calm boy. He's an excellent leader, ensuring there are no disagreements or quarrels within his team. He's a skilled operator of small robots. He's extremely loyal and devoted to his friends, as demonstrated in the second season—when Katsu and Ami were kidnapped, he was willing to do anything to save them. Van loves LBXs, as they're his only connection to his biological father, Dr. John Yamano, the creator of all LBX robots.

LBX robots
Van's very first robot was AX-00, later renamed Achilles due to its corresponding exo-equipment, then Odin, his fourth robot was Elysion, his fifth was Icarus Zero, and his sixth was Odin MK-2. His temporary robots included Bishop, Bulldozer (during the repair of Elysion), Royal Legion (during the defense of Tiny Orbit), and Achilles D9 (during the battle for the Perpetual Motion Machine's energy processing center).

Biography
Van was born in 2037 to John Yamano, the founder and inventor of LBX, and Mari Yamano, a housewife. He became interested in LBX robots at the age of six (or more). His mother didn't object until 2045, when a plane carrying Van's father "disappeared." The plane crash was announced on television. This continued until 2050. Until that year, Van's life had been calm and measured, but without LBX, due to his mother's prohibition and the painful reminder of her husband.

In 2050, Van's life changed forever... On his way home, a woman (later revealed to be Rina Richardson, Dr. Yamano's assistant) bumped into him and, muttering something about "humanity's hope and despair," fled from the New Dawn Followers pursuing her. The box she gave Van contained a lightweight AX-00. After unpacking and launching it, his house was attacked by New Dawn Followers seeking to take the robot. Van managed to fend off the unknown enemy. However, the battle left a mess, as Marie noticed. Fortunately, she held no ill will towards the boy, and the next day, she allowed Van to keep the robot and continue playing LBX, but on the condition that he become the best and never lose.

Eugene (Red Crow) is a minor character in the first season. He is the apprentice of Master Otaku and is an Otaku Ranger.

and, apparently, rules over them. His robot is LBX - Birdbrain X.

Appearance
Eugene has short black hair, a blue suit, fair skin, and round glasses. He feels much more confident in his Red Crow costume. In this costume, he wears a terracotta sweater, a bird mask with an open beak, and white sneakers.

Personality
He deeply respects Master Otaku, detests Daka Sendou's "dirty tricks," and sincerely believes that his "brothers and sisters" are fighting for peace. Sometimes it seems as if this hero is completely out of his mind...

Personality
Sarcastic, brash, cunning, and superstitious. He believes tarot cards can predict things, though Gordon considers them useless. He speaks haughtily to many, as if they were servants, and looks down on them. He never minces his words. He's quite impudent and mischievous. He seeks only personal gain and glory. In battle, he's unpredictable, earning him the nickname "The Devil from the Snuffbox." His birthday is July 12th.

Appearance
He has purple hair with a lilac streak in his bangs, indigo eyes, and fair skin. In season one, he wore a long purple tunic with white triangles along the edges, an ochre jacket with a purple hood and a wide neckline, dark gray pants, and black boots. In season two, he also had a brown jacket, but a purple scarf was added. The dark gray pants and black boots remained. In season three, Duck wore a black jacket, a white shirt, black pants, a brown scarf, and his hair was long and braided in a ponytail.

LBX robots
His LBX robot was initially the Harlequin, then the Harlequin MK-2, an improved version. Later, his robot became a more advanced version of the Harlequin, Mara. As a slave player, Nadir used Mara, which he continued to use after his release.

Appearances
He didn't switch sides with Van and his comrades of his own free will, but because Gordon forced him to (before the fight, they made a deal: if Sendo defeated Gordon, he would be his slave for life, and if Gordon won, Sendo would become his servant). But Hans Gordon isn't like Duck—he needed Van to win, and Gordon wanted to help. He forced Duck to switch sides with Van Yamano. After the Akiba Kingdom tournament, which ended in Van's favor, Gordon shouted at Duck that he no longer considered him a servant. Duck left, but had no intention of becoming an antagonist again. He frequently appeared in K.R.O., assisting Van and his team in the fight against terrorism. He also participated in the battle on the Saturn.

Interesting facts
He has a younger sister, Kiyoka Sendo. But unlike her brother, she has a calmer personality.
Hans Gordon can't stand him, and the feeling is mutual, but despite this, they work well as a team.
Sendo calls Gordon's fighting style "rough," to which Hans replies, "I could say the same about you." It's hard to agree, though, as Sendo's robots fight gracefully.
He's also called "The Devil from the Snuffbox" because of the Harlequin. He controlled three robots simultaneously, and the enemy thought they were copies, but they were actually clones. Only Dak controlled them very quickly. Justin Kaido was the first to realize this: he explained that if you look closely, you can see that one robot is slightly ahead of the other two—it's the real one. This is called an "Illusion Attack."
Duck Sendo - looks like Puss in Boots from Shrek.