 If you liked
The Big O
|
 ...then you might like
Lupin III
|
Both Lupin III and The Big O have this old-fashioned animation style that looks about the same. Although, Lupin has a different storyline, but I see the similarities in both Lupin and Roger, they are (not) detectives, but you know, they have the feeling they want to be one and then act towards being one.
They're both pretty fun to watch although The Big O has a more Sci-Fi feel to it while Lupin has this dramatic-comedy feel to it. Both are enjoyable and decent to watch.
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Recommended by Angry_Anime_Nerd