 If you liked
Tengen Toppa Gurren Lagann
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 ...then you might like
No Game No Life: Zero
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Both anime have the same theme: the strenght of hummanity and it's power to fight on against all odds. Both also feature a war that humanity is involved into, bittersweet moments and hints of romance; although TTLG is more over the top and comedy centered, in other hand NGNL Zero is a war drama.
Both are about humanity achieving a goal that is not thought possible since they are far weaker than their enemy. Also, Schwi and Nia are very similar characters.