If you liked
Mahou Shoujo Madoka★Magica
|
...then you might like
Flip Flappers
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Both are magical girl anime that are much darker than they initially seem (to a greater extent in Madoka).
If you liked
Kiseijuu: Sei no Kakuritsu
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...then you might like
Devilman: Crybaby
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Both main characters experience a drastic change in their lives when they're taken control of by a monster. Both anime have monsters lurking in the shadows of society. Parasyte's are alienlike while Devilman's are more supernatural. Both anime have plenty of body horror and gore. Both anime aren't afraid to kill off important characters. Both anime can get dark at times though Devilman has Parasyte beat in this department.
If you liked
Steins;Gate
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...then you might like
Mahou Shoujo Madoka★Magica
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Both have a dark and nasty plot twist you don't see coming.
If you liked
FLCL
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...then you might like
Dead Leaves
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Both are insanely wacky anime with very sporadic animation. Dead Leaves animation is much weirder and harder to get used to. Both have no lack of comedy and are pretty funny. Both can be pretty vulgar. Dead Leaves is the much more raunchy one of the two. Both have good dubs though that is merely subjective. Both are very confusing but can still be enjoyed if you don't understand them. Both have very high rewatch value due to how short they are in length. Dead Leaves is less than an hour long while FLCL can be finished in under 3 hours. I prefer Dead Leaves though that is just me.
If you liked
Ergo Proxy
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...then you might like
Casshern Sins
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Both are very dark and dreary and have a similar atmosphere. Both take place in a post-apocalyptic dystopian world. Casshern Sins is more accessible than Ergo Proxy because it is easier to understand.
If you liked
Higashi no Eden
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...then you might like
Zankyou no Terror
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Both use terrorism as a main plot point. Both have young ladies tagging along with the main character(s). Both have an element of mystery involved. Both anime are 11 episodes. Higashi no Eden is much more lighthearted and silly while Zankyou no Terror is much darker and edgier. In Higashi no Eden, the mystery revolves around the main character's lost memories while in Zankyou no Terror, the mystery revolves around the main characters' mysterious pasts. Personally I prefer Zankyou no Terror though Higashi no Eden was pretty good nevertheless.
If you liked
Elfen Lied
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...then you might like
Higurashi no Naku Koro ni
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Both anime are very bloody and and brutal anime with cute girls to comfort you. Elfen Lied has much more fanservice than Higurashi and is considerably bloodier Higurashi is much more psychological and requires a lot of piecing together to completely understand. I believe Higurashi is the scarier one of the two though that's just me.