In his Lumino life, Shinji is Kazuma's younger twin. While he may not have been able to get into contact with him for a while, he still thinks about him and his well-being from time to time.
In reality, Shinji is not his real name, nor he is Kazuma's twin. He is actually Kazuma Kenzaki from an alternate world, which explains some of their similarities in the first place. He's also a lot quieter and distant than this Kenzaki.
Hajime Aikawa
This suspicious photojournalist tried to capture some of the company's files for a big scoop. Kenzaki tried to chase him off and eventually got a bloody nose in the process. Kenzaki continues to be on the lookout for this man if ever he shows up to cause trouble again.
But originally in his world, this man is the physical manifestation of death and destruction, and his mere existence will cause the world's end if he remains the only Undead standing. Kenzaki befriended Hajime and learned that the latter wished to become human and rather not destroy the world. He firmly believes in this, to the point that he saved his friend from regressing to his wild instincts.
Sakuya Tachibana
Tachibana is a researcher in the biotech firm Kenzaki works at. He admires Tachibana for his dedication and hard work in his job, but does worry about him at times whenever he overworks.
Much like in his Lumino life, Tachibana is also a researcher from Humanity Foundation, and under BOARD he is a Kamen Rider like Kenzaki. Tachibana is Kenzaki's partner, mentor and close friend.
Isaka
Can't say if they're familiar with each other in their Lumino life, but in reality Kenzaki definitely recognizes Isaka and is very wary of his presence.
Why is that?
He's the Peacock Undead. And Kenzaki knows very well of the chaos he made back then in their world. And he's really not too happy about being part of his experiments. That wasn't cool.
Junichi Shimura
WHO IS THIS GUY???
NO REALLY WHO?????????
?????? ?????? ????????
Hiroto Marvey
Shinji's roommate. He's a rather odd man, brash and blunt. But since his twin trusts him, and Kenzaki himself has met him face to face during a dinner date, he doesn't seem so bad. So he hoped they get along by the time he managed to move into their apartment with them.
His real name is Captain Marvelous. And he's an actual pirate. SPACE PIRATE. BECAUSE SPACE IS AWESOME.
Annalise Delacroix
Fellow roommate of Kenzaki's. All he knew about her is that she came from a rather well-off family and moved into Lumino to live her life on her own.
Yu Narukami
So this kid happens to be Kenzaki's roommate. No one knows how he got to move in without their notice, but heyooooooooooooooo why not have him around?
Besides, this kid seemed cool.
Shin Tensou
Another resident of 104 and fellow roommate, Kenzaki pities him due to his roommate's current state does look after him at times whenever he's off duty. Though they may not talk much, at least he tries to help and reach out to him.
Relationships
In reality, Shinji is not his real name, nor he is Kazuma's twin. He is actually Kazuma Kenzaki from an alternate world, which explains some of their similarities in the first place.
He's also a lot quieter and distant than this Kenzaki.But originally in his world, this man is the physical manifestation of death and destruction, and his mere existence will cause the world's end if he remains the only Undead standing. Kenzaki befriended Hajime and learned that the latter wished to become human and rather not destroy the world. He firmly believes in this, to the point that he saved his friend from regressing to his wild instincts.
Much like in his Lumino life, Tachibana is also a researcher from Humanity Foundation, and under BOARD he is a Kamen Rider like Kenzaki. Tachibana is Kenzaki's partner, mentor and close friend.
Why is that?
He's the Peacock Undead. And Kenzaki knows very well of the chaos he made back then in their world. And he's really not too happy about being part of his experiments. That wasn't cool.
NO REALLY WHO?????????
?????? ?????? ????????
His real name is Captain Marvelous. And he's an actual pirate. SPACE PIRATE. BECAUSE SPACE IS AWESOME.
Besides, this kid seemed cool.