If you're looking for anime similar to Tsuritama, you might like these titles. All recommendations are made by Anime-Planet users like you!
Poor, short, and unathletic Joey Jones has always been picked on by the rich kids at his school. But when a lightning bolt turns a toy robot he salvaged from the trash into a hulking, remote-controlled bruiser, Joey becomes the only thing standing between humanity and a terrifying race of alien invaders, The Skrugg. If he's going to save the world, however, he's going to need the help of his friends Psy, Lina, and Professor Denton, along with more courage than he ever knew he had.
As the sole member of a club dedicated to helping others, do-gooder Madoka Kyouno didn't hesitate in helping save a girl from drowning one day. But little did she know that she actually saved an alien named Lan, and that soon, Madoka herself would be in the pilot of a giant mecha...
The above is a preliminary synopsis that will be updated once more episodes of the anime have been released.
In the future, all facets of society are tied into OZ, a virtual world inhabited by millions of users. Kenji, one of OZ’s moderators, was set to begin another typical summer when the lovely Natsuki asked him to accompany her to her hometown as a job. However, little did Kenji know that the 'job' entailed pretending to be Natsuki’s fiancé in front of her eccentric family! Now on display and feeling like a fish out of water, Kenji tries his best to fit in with Natsuki and her relatives, until one day he receives a mysterious math problem through a text message. As an avid math fanatic Kenji can’t help but try to solve it, unaware that his actions may jeopardize not only OZ, but also the entire world...
Natsume is lonely; he has an ability that separates him from others: he can see and interact with spirits. Soon, however, Natsume discovers that he’s not alone: his grandmother Reiko also had the gift. But things get hectic and possibly dangerous for Natsume when he finds out that he also inherited the 'Book of Friends', a book that contains the names of all the spirits Reiko defeated and subjugated. He finds himself hounded by his grandmother's underlings and, with the help of a 'cat' charm spirit, decides to free them from the Book's shackles, as well as protect the book from those who seek to misuse its power...
While these two series have different plots, they both involve a boy who has trouble making friends who meets a non-human being that changes his life. The main characters of both series make some friends as their respective series go on. Both series are mostly lighthearted and laidback (though Tsuritama does get a little bit tense in the last couple of episodes). Both series also have plenty of funny moments (though Tsuritama's humor is often crazier than Natsume Yuujinchou's) and you get a feel-good feeling after watching both series. Overall, I think if you like one, you will probably like the other.
In both of these watery anime, a mopey/awkward high school boy suddenly finds himself living with a supernatural guy (either merman or alien) who's determined to cheer him up. Kono Danshi is BL (though it's very sweet and not at all explicit), and Tsuritama is not (though it is about strong male friendships, and has a really similar character dynamic).
Both of these anime are animated with bright colors and patterns (though Kono Danshi was made entirely by one person, so it's very low-budget).