If you liked
Seihou Bukyou Outlaw Star
|
...then you might like
Photon
|
both have extremely similar art styles and animation direction, both are set in space with a space opera kind of theme to them, both have practically the same genre's except for photon containing some minor ecchi (ye been warned)
If you liked
Tiger & Bunny
|
...then you might like
Metallic Rouge
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partners fighting crime mcs, sort of. both being original anime (until Tiger and bunny received a manga adaptation) set in a far off futuristic time, the cast for both are shown controlling mecha bodysuits similar to iron man. both contain android-like people in their storylines at some point and the mech designs in both of these series have similarities, along with the action scenes. if you love one you'll find something to like in the other
If you liked
Kick-Heart
|
...then you might like
Ring no Seraph
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Both about wrestling matches including colourful characters and animation, both are fairly short (only a few minutes each) if you like one of these i can easily recommended you to try out the other to see if you like it
If you liked
Pikmin Short Movies
|
...then you might like
With Pochi! Yoshi's Woolly World Special Anime
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Both were short unique anime released by Nintendo that were available on the Nintendo 3DS, Both contain silly unusual creatures that do wacky things over several episodic parts.
If you liked
Redline
|
...then you might like
Space☆Dandy
|
both main characters have a pompadour, both fast paced with action and good animation both fairly futuristic set in space both contain racing at some point or another
If you liked
Gon
|
...then you might like
Doubutsu no Kuni
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both manga focused on animal characters with amazing detailed artwork, both have a character getting by and a similar-ish theme of being in the wild.
If you liked
Homunculus
|
...then you might like
Ultra Heaven
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similar detailed artwork to show off super natural themes surrounding the main characters, both go into details of messing around with peoples heads, both are seinen.