 If you liked
Megalo Box
|
 ...then you might like
SK∞
|
Anime don't necessarily have to have similar plots or characters to be similar.
The similarities between these 2 are heavy themes- SK8 has street skating, graffiti, hip-hop, bright colour palette to create an impression on the viewers while Megalo Box uses Underground boxing, futuristic themes in an old animation style for the same effect.
Plot wise, both are based on sports and some amount of friendship/rivalry
If you are a fan of either anime for its direction/art/aesthetic you should consider checking out the other