If you liked
Koukaku no Regios
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...then you might like
Sword Art Online
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Ok so this is kind of a stretch because the settings in SAO and CSR are totally different: one being inside a MMORPG and the other a post apocalyptic world with moving cities. However they are very similar in the sense that the main characters between the two are both total badasses. Kirito being a solo player on the front lines who doesnt need any help and Layfon being one of the 7 heavenly blades or whatever in disguise at an ordinary school/city. So basically if you enjoy watching the main male lead go ham and wreck the opponents then both of these shows are a good choice. However I personally am leaning towards SAO as a better choice right now as its story seems more solid and CSR has a sorta slow beginning but if you have any free time and feel like watching someone be awesome then you should check it out.
If you liked
Erementar Gerad
|
...then you might like
Kore wa Zombie desu ka?
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In terms of plot they arn't really similar one being a adventure and the other sticking in one city Its main similarity is between Ren and Yuu. They are both unable to show emotion and rarely speak if at all.. ren because she doesnt understand and yuu because it affects the world when she does.