 If you liked
FLCL
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 ...then you might like
Tengen Toppa Gurren Lagann Movie 1: Gurren-hen
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If you enjoyed Tenga Toppa Gurren Lagann (either the movies or the series), you will probably appreciate FLCL. Both use an absurd but well-done art style, have chaotic plot elements, utilize mechs heavily, and are strange/avant-garde. The overall message of each series is different (FLCL's being more about maturation while Gurren Lagann more about overcoming), but both are bildungsromans at their core. All-in-all, pretty similar.