There are many animes of this type. Here are some recommendations: 1 " Steins;Gate ": This is an anime about time travel. Tomoya Okazaki, one of the protagonists, was initially considered an invincible existence, but an accident in an experiment caused his time travel ability to fail. Attack on Titan: This is a very popular anime. The protagonist, Alan, is an invincible existence at first, but after his wall defense system is destroyed, he is forced to face all kinds of enemies. 3 Demon Slayer: This is an anime about combat. The protagonist, Tanjiro, was an invincible existence at first, but his family was destroyed by ghosts. He became a warrior who searched for ghosts. Date a Live: This is an anime about dating. One of the main characters, Kuromu Kaito, was an invincible existence at first, but he was forced to complete a mission with other characters, which changed his fate. 5 Sword Art Online: This is an anime about a virtual reality game. One of the main characters, Kirito, is an invincible existence at first, but his game character is drawn into a dangerous virtual world. He has to fight with other characters.