 If you liked
FLCL
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 ...then you might like
Ouritsu Uchuugun: Honneamise no Tsubasa
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Pretty much any Gainax work have some common threads, but Honneamise and FLCL have a similar sense of sadness about them. This is due to both main characters having a dream/ideal can't really be met with their current lifestyles. Mundane life is expressed in both through a sense of directionless inertia on the part of the main characters. Both of the main characters also meet a woman (Riquinni for Shiro and Haruko for Naota) who change their lives. While completely different in style (surrealist/superflat vs. hyper-realism) they remain comparable in my opinion.