Strategic RPGs with a complex plot involving geo-political events and a steampunk atmosphere and robots. Also, wonderful and multi-faceted characters. Soundtracks are also very beautiful.
It's baffling to think that Squaresoft/Square Enix only localized a few games and only two games were released in Europe! The series has a five mainline entries (only Front Mission 3 was released in Europe; 1, 3 and 4 were released in US---1 through the DS porting), plus a sort-of-reboot with a TPS gameplay (Evolved on PS360... Forgettable) which was also released overseas. It has a side-scrolling action game on SNES (Gun Hazard---listen its OSTs, very reminiscent of Final Fantasy VI and VII OSTs! There's an english fan-translation, try it!), a RTS on PS1 (Alternate), and a few other spin-offs (Online on PS2 and PC and 2089 on DS/mobile).
So the series is pretty great. It seems the best entry out there, Front Mission 2, was never localized. Front Mission 1st was released only on DS. Front Mission 5, one of the best entries, not localized. A shame, if you ask me.
Front Mission creators were heavily influenced by Fire Emblem. They were also able to introduce mature contents in their stories. For example, Front Mission 2 had a gay character, something not very common today, let alone in mid-Nineties! The general tone is very epic but at the same time grounded in realistic political settings.
Gameplay-wise it is an interesting though traditional sRPG with mechas and each entry introduces many new elements. My suggestion is to buy Front Mission on DS which is the definitive version of that game and maybe Front Mission 3.
Now, Square Enix is working on a supposedly new entry in the series: Left Alive. Now, I think that's great BUT: it's not a sRPG, rather a TPS. It has robots but the atmosphere looks more dystopian and less grounded than previous entries. Also, it's not clear how many people from the original team are working on the game.
Surely it looks great but don't you think it's time to bring overseas some actual Front Mission games? Front Mission are known to be top-notch sRPGs; now that sRPG games are popular again overseas (Fire Emblem is a 2 million franchise; Disgaea 5 did very well on PS4 and Switch; Valkyria Chronicles is popular even though doesn't have a very similar gameplay) I do think Square could work on some remake or collection. After all, Front Mission was released overseas 15 years later its original appearance, and Square seems willing to bring over Mana collection or localize Romancing SaGa 2 so it's never too late for some Front Mission bonanza!