ēlDLIVE

A teenage boy has an alien living inside of him. The alien sometime causes him to say/do perverted things. The alien causes him to act strange in other ways, such as at school and at home. The girl the MC has a crush on thinks he is a pervert because he did/said something perverted to her/in front of her. 

Terra Formars and elDLIVE are both anime about people with special powers fighting aliens to protect earth. One of the main characters in both series had a friend die, and this is the main reason they fight. The main male character is an orphan in both series. Almost all of the main male characters are perverts. The main male character has a crush on the main female character who is blond in both series. She hates it when he looks at her sexually. The base of each team is a spaceship. Both series have a fair amount of flashbacks. They fight for an organization, U-NASA in Terra Formars, and the space police force elDLIVE in elDLIVE. Both shows have some transformation sequences. Terra Formars is much darker, and is a thousand times more violent. read more 

Both anime are adaptations of Shonen Jump manga by Studio Pierrot. The main female character hates the main male character in each how, however do to their situation they have to spend time together. The main female character accidentally catches the main male character doing something perverted. Chuuta in elDLIVE has to join the Space Police force elDLIVE. In Twin Star Exorcists Rokuro and Benio are forced to become exorcists. 

An average teenage boy gets an overpowered superpower, and joins a group to protect earth from aliens. The group is a mixture of humans with powers and aliens. Both anime are adaptations of Shonen Jump manga. Both anime have anime original endings, and anime original characters. 

A human and an alien need to learn how to share a body. The main character uses their alien's power to protect earth from other aliens. Both shows have great art and animation. Both shows have some transformation sequences that show a lot of skin. The main character fights because of a tragedy that happened in their past. The main character's father is dead in both series. The main character works for an organization who's goal is to protect Earth from harmful aliens.  

MC is similar in both shows He helps out with weird creatures The girl has a similar character to the owner of the mononokean The style is almost the same 

Not only are they both made by Akira Amano, the stories are similar too. A protagonist with (at the start) no friends and with little to no self confidence gets chosen to become part of a dangerous group (the Vongola Mafia group and the ElDLIVE space police). Although they both are reluctant at first, they become stronger, make new friends they want to protect at all cost and in the end, discover this new change of living isn't as bad as they first thought. Both series take a little bit time until the story becomes interesting (khr about 20 eps, ElDLIVE about 4), but they are both filled with nice action scenes and have a good amount of comedy.  read more 

Both MCs are dragged into working as space police Both shows have weird aliens Both shows start out from school Characters are kind of similar