If you liked
Cowboy Bebop
|
...then you might like
Lupin III
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They share mainly stylistic choices, plot patterns, dialogues and tones. They also share the trope of a group of skilled but poor "outcasts" that live adventures in many different and distant places: they spend their time between solving dangerous troubles, finding themselves in unusual situations, trying to find money and getting something for their own needs or sake. Characters also share some personality traits, like the taciturn skilled buddy or the cynical girl. There are also many references in Cowboy Bebop that are obviously tributes and homages by Shinichiro Watanabe to Lupin III.
If you liked
Love Hina
|
...then you might like
To LOVE-Ru
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They share the same type of main character: a shy, wimp male protagonist surrounded by beautiful girls, often victim of misunderstandings and thus beaten up after involuntary embarassing situations. Eventually, he also starts to get the affection of those girls thanks to his kindness and goodwill. Besides, he is irresolute with his feelings in love triangles, a situation that easily leads to comedy and funny situations in both mangas. The main differences are that To LOVE-Ru is also heavy ecchi, with a lot of nudes and fanservice, as well as full harem without settling relationships, while Love Hina quickly develops into a romantic triangle.
If you liked
Ranma ½
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...then you might like
To LOVE-Ru
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Many shared tropes, particularly the involuntary tendency of the male protagonist to become the love interest of many girls and his shyness, some stereotypical characters, but also the supernatural adventures and the strange competitions and situations inside the school. However, Ranma 1/2 lacks the high level of ecchi fanservice that To LOVE-Ru has and the male protagonist is not as skilled as Ranma.
If you liked
Urusei Yatsura
|
...then you might like
To LOVE-Ru
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Basically, they share the same basic narrative components and tropes: first of all the alien girl with magic-like powers who falls in love with the main character in chapter 1; similar supernatural or science fantasy comedic situations; bizarre adventures; silly inventions; funny aliens; stereotypical characters whose caricatural traits are played straight for fun (like the rich and conceited classmate, or the strange headmaster). It's almost the same story and sometimes the script is so blatant that you could say that there is plagiarism. Still, there are some differences in the end. The first difference you will notice is that To LOVE-Ru is much much more ecchi than Urusei Yatsura, with a lot of nudes and fan service. Plotwise, the male protagonist of Urusei Yatsura is portraited as a perverted idiot, while the male protagonist of To LOVE-Ru is only shy and wimp. Girls might be rude with him because of misunderstandings, but they are usually milder and eventually fond of him (much like Keitaro from Love Hina). Besides, this also means that To LOVE-Ru goes into the harem genre, so there is a bit of teenage romantic relationships and girls can be potential companions (still like in Love Hina), while Urusei Yatsura doesn't go into this and girls are simply annoyed by all the perverted gags.