 If you liked
Kidou Shinseiki Gundam X
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 ...then you might like
Fushigi no Umi no Nadia
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Nadia and Gundam X share a lot of similarities.
Although Nadia lacks giant robots, but it's also about a normal boy and a mysterious girl with mysterious power who meet in a fateful encounter, become part of a ship piloted by a captain with sad past involving war and death.
The young couple and the ship crew all try to survive the world and fight evil alone to make a better world.