 If you liked
Mai-HiME
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 ...then you might like
Brigadoon: Marin to Melan
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Both anime involve a main character who gains the power to summon a robotic being to fight for and protect them (more characters can do so in Mai-HiME). They start off lighthearted and comedic, but take a darker turn and get very serious and angsty. The main charcters go through quite a lot of difficult, traumatic situations, yet try their best to make life better for everyone.