Yuuya Tenjou

Yuuya Tenjou (天上優也, Tenjō Yūya) is the main protagonist of the series. He was once the get bullied by his family and classmates. However, after discovering the door to another world, he get to know about magic and later became a strong being in the another world as well as on his own world, Earth.

Appearance
Yuuya was born healthy but with an appearance that was nowhere near attractive, describing as 'ugly' by his own blood parents, he was unusually fat and couldn't loose weight no matter how much he tried.

After finding the door to another world by accident and gaining a huge level-up, his appearance skyrocketed to point where he's described as someone who's attractive than anyone else.

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Personality
Yuuya is an incredibly kind person, he doesn't even hate his old bullies and not even his parents who abandoned him, but he has serious 'inferiority complex' and suffers everyday from it from his interactions with people, he has low self esteem and has lack of confidence in anything he does, because of his past 14 to 15 years of trauma since his birth.

*more information is required*

Unnamed Grandfather
So much of his Grandfather stays a mystery since he has a secret room built-in inside his house and inside there countless weird stuffs he collected from all over the world including the door to another world, but Yuuya's grandfather loved and cared for Yuuya deeply, and took him in when he was pretty much abandoned by this parents, he himself hates Yuuya's parents, it wasn't mentioned if he was his Maternal or Paternal Grandfather.

*more information is required*

Unnamed Parents
He is and was unloved by his parents since his childhood since he was born with a face that was nowhere attractive to their satisfaction and couldn't loose weight. His parents cares only a people's looks since they neglected Yuuya and spoiled his younger siblings who were born attractive.

They are also greedy for money, since they tried to take Yuuya's Grandfathers wealth that was passed to Yuuya after his death.

*more information is required*

Youta & Sora Tenjou
He loves both Youta and Sora just like any normal caring older brother would, even though he was continuously bullied and looked down on by them. They're spoiled, thinks highly of themselves and are blond, in short both of them are piece of shits, being saved by Yuuya in a gang fight they asked for his forgiveness for their past mistakes, still it's not clear how much they regret.

Both of them were introduced and appeared in Volume 1, there have been mentions but didn't make any appearance after Volume 1.

*more information is required*