If you liked
Heroic Age
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...then you might like
Ginga Kikoutai Majestic Prince
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Genre: Space, Sci-fi, mecha, drama The character designs are made by the same artist and are similar. The stories involve humanity being severely outgunned and threatened with extinction by a fearsome alien force. The motivations for the aliens' desire to fight humanity are both interesting and extend beyond simple "evil empire wants to conquer you" plots. The aliens also look very similar. There is a focus on main characters that aren't seen as the typical heroes and aren't well-understood or appreciated by their comrades. As the stories progress, things change and the main characters prove themselves to be more reliable and capable than previously thought.
If you liked
Kuromukuro
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...then you might like
ID-0
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Genre: Mecha, Drama, Sci-Fi, some comedy Both are kind of underrated anime where the characters grow on you and the story slowly reveals itself to be decent. One main character in both series is inserted into an unfamiliar and uncomfortable situation with a group of complete strangers. These groups of people grow to understand one another and work together.
If you liked
Gundam Build Fighters
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...then you might like
Knight's & Magic
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Both are based on the love of mecha. The MCs are extremely talented at designing cool and unique robots based off of predecessors. The atmosphere in both is light and fun. The "Isekai" portion of Knight's and Magic does not factor in a huge amount and it was only mentioned in the first episode to give reason for why the MC is so good at robot design and "programming".
If you liked
Tenkuu no Escaflowne
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...then you might like
Knight's & Magic
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Genre: Fantasy, Mecha, action, drama Both MCs travel to another world where giant, knight-like robots are piloted by warriors against monsters and enemy mecha in a fantasy and magic setting. Escaflowne is older but the art and execution hold up and the mecha probably look better than the CGI of Knight's & Magic to most. It is though a far more serious story but a more refined product. Knight's and Magic focuses on a light-hearted story about the MC's dream of making his own robot in this fantasy setting where robots are real.
If you liked
Break Blade Movie 1: Kakusei no Toki
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...then you might like
Knight's & Magic
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Similar in that there are mecha in more fantasy setting but the similarities probably end there. Tone and presentation are completely different. The emphasis on Knight's and Magic is the light-hearted telling of the Main Character's goal and dream of completing his own personal, amazing mecha whereas Break Blade is very serious and conflict-driven.
If you liked
Full Metal Panic!
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...then you might like
Kuromukuro
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Both have a displaced warrior/soldier that pilots a mecha. He is proficient at his martial skills, and is initially cold and serious. He meets a regular girl and has to adjust to what it means to live a peaceful life in a different setting. In the end, he finds new things to protect and better reasons to fight. Both take some time to get rolling but have pretty solid characters and plots.