If you liked
Babel Nisei (OVA)
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...then you might like
Giant Robo the Animation: Chikyuu ga Seishi Suru Hi
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Both are OVAs with superpowers and mechas although Giant Robo is a traditional mecha series while Babel II is a shounen with one mecha like additional. Also Kamiya Koichi and Daisuku Kusama (main characters) are young students.