The protagonist, Old Man, is very attractive but a terrible slob, a failure as a father, and works as a toilet seat designer. He is divorced from his wife, and lives with his daughter, Min-chan, who is both very smart and athletic. One day, as he was taking a dump, he was sucked into his toilet and given the important job of becoming a hero to save the world. He ends up having to give up his good looks for a chubby frame in exchange. Old Man's battle to protect the Earth and Min-chan is about to start.—Anime-Planet

For Uncle, a lecherous but handsome toilet designer, it is just an ordinary day of neglecting his duties as a single parent to hit on women and talk about his "superpower": his ability to tell a lady's hip size at a glance. But when he is sucked down into a toilet, the Space Peace Republic Alliance Hero Committee gives him real superpowers, and he becomes the hero of Earth. There is only one problem-he has become an ugly, unrecognizable fatty who is unable to reveal his real identity. Uncle's beloved daughter Min-chan does not believe that such a vulgar fatty could be her father, and casts him out of his own home. Distraught and homeless, he joins up with his perverted neighbor Yamada-san, a small man with a fondness for streaking, and sets out to convince Min-chan that he is her father. Full of sexual innuendo and slapstick humor, To Be Hero follows Uncle as he befriends bizarre allies and combats even more bizarre foes, fighting for the future of earth against aliens and-more importantly-his future with his daughter.—MyAnimeList

"Ossan" (pops), is a handsome yet undisciplined man and a divorced father who has a job as a toilet seat designer. He lives with his daughter Min-chan, who excels in both academics and sports. One day, while on the toilet, Ossan is sucked into it and becomes a hero charged with protecting the world. In exchange, he transforms from his handsome form into a chubby appearance. Ossan's fight to save the world and protect Min-chan begins.—Anime News Network

The protagonist, known only as "Ossan" (pops), is a handsome yet undisciplined man, a divorced father who has a job as a toilet seat designer. He lives with his daughter Min-chan, who excels in both academics and sports. One day, while on the toilet, Ossan is sucked into it and becomes a hero charged with protecting the world. In exchange, he transforms from his handsome form into a chubby appearance. Ossan's fight to save the world and protect Min-chan begins here.—AniDB

Handsome, divorced and with a teen daughter living with him, our hero is a "bad father" who works as a toilet seat designer. One day, as he was in the toilet, he founds himself sucked into the toilet seat and he is given the important task to save the planet. The price for being a super hero is quite huge: This Good-looking guy is transformed into an Ugly Dude...with Super Power. To protect the Earth and his daughter Min, his fight is about to begin.—AniList