 If you liked
Shoujo Kakumei Utena
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 ...then you might like
Star Driver: Kagayaki no Takuto
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If you like FABULOUS fighting, transformation scenes, a song that's played before each battle and questioning your sexuality after watching each episode you'll love both of these.
This is an excellent series to compare and contrast with Star Driver. After watching both series, one can see countless parallels between their characters, plot, and structure, to the point that Star Driver is often referred to as Utena done with giant robots. You will have a lot of fun pointing out all of the little shout-outs to its spiritual predecessor.