If you're looking for anime similar to Full Metal Panic!, you might like these titles. All recommendations are made by Anime-Planet users like you!
Yoichi Karasuma is a strong young samurai who was born and raised in the mountains. One day his father decides to send him to the city to stay with the four Ikuraga sisters so that he can gain valuable life experience, but his first trip into civilization doesn’t go quite as planned. Not only is he late to meet his new hostesses, but he is labelled a pervert and manages to get himself arrested – twice! Now, as he lives at the Ikuraga Dojo with Ibuki, Ayame, Kagome and Chihaya, Yoichi must adapt to his new life at school while accepting the rather violent ‘training’ he receives from Ibuki. After making an enemy of the school delinquent and with a mysterious man after his life, it seems that Yoichi’s quest to gain life experience won’t be so smooth after all!
As the sole member of a club dedicated to helping others, do-gooder Madoka Kyouno didn't hesitate in helping save a girl from drowning one day. But little did she know that she actually saved an alien named Lan, and that soon, Madoka herself would be in the pilot of a giant mecha...
The above is a preliminary synopsis that will be updated once more episodes of the anime have been released.
Rinne no Lagrange is much less entertaining than Full Metal Panic!, but both share a similar sense of duty as well as similar genres. If you liked Rinne no Lagrange, you should like Full Metal Panic!, and if you're picking at straws for anything similar to Full Metal Panic!, then you could go with Rinne no Lagrange.
In Sternbuild City, corporate logos not only cover billboards, but also the costumes of the super-powered heroes that act as its protectors. Veteran and newcomer warriors of justice alike compete in a reality TV show that offers points for apprehending criminals while giving champions' sponsors a chance to promote their brand. When the low-ranking Wild Tiger loses his backing after a string of outrageous, botched rescues, he finds himself paired with an up-and-coming spotlight-seeker called Barnaby. But with their wildly different personalities, will the pair be able to save their beloved Sternbuild City and win the game show, or will their constant tension be the undoing of the world's first hero team?
Mouretsu Pirates and FMP mix elements of school life with elements of military/sci-fi, and both feature schoolgirls filling unusual roles like captain and admiral. If you like cute girls with big personalities and a light side of sci-fi, you're in for a treat on either of these shows.
Hazama Masayoshi is a successful model who's been enamored with righteous masked heroes since he was a child - so much that as an adult, he’s decided to become Samurai Flamenco: the masked hero of justice! But much to his dismay, the job isn’t as easy as it seems and during his first night as Samurai Flamenco, the man is knocked out and saved by police officer Hidenori Goto. Swearing to keep his secret, Hidenori quickly becomes Hazama’s friend and partner on the job, but soon the pair find themselves in a sticky situation. Not only is the media determined to discover Samurai Flamenco’s true identity, his actions also trigger copycats, flooding the city with other masked heroes!
Both of these series focus on the relationship between an unlikely pair, and jump frequently between action and comedy, switching between light-hearted and goofy to dramatic and serious depending on the episode. Ultimately it's the characters and the relationships they share that keep both of these series from going COMPLETELY off the rails (although both come close at least a couple of times IMO).