For you mecha head I have a couple I recommend Patlabor (Ova, TV, 1st Movie , 2nd Movie, pretty much everything except the 3rd movie) Patlabor is one of my favorite mecha animes. Mostly because it dives into the idea of Mecha for everyday purposes from construction, firefighting, to even Police duties. the Series is serious yet comical at the same time and focuses on a Police Division using Labors (the Mecha in the show) It also dives into various subject and is a blast to watch and the Movies are very well done. I recommend this series except the 3rd movie since the 3rd movie isn't that good and miniplato (unless your a fan of chibis) Armored Troopers Votoms This is a anime series I love because the Mecha is grime and gritty. Votoms is like WWII with mecha. which the story drells into war. The story is pretty interesting and the mecha design is very down to earth. I recommend not only the tv show but palisan files, and the other OVAs/Movies you won't be disappointed Gasaraki Gasaraki is created by the same person who did Votoms with the mecha designer that did not only the labors in patlabor ,but some of the mecha from the gundam series. Gasaraki takes place in a alternate Gulf war and talks about a experimental squad testing out assault mecha. Just like votoms the story focuses on war and the mecha designs look like something that can be done. the story is very good minus a few time diving into the mystical side. still a fun one to watch. Gunbuster I love this OVA heavily and has a wonderful story. the art is very nice though the show borders the line of super robot due to the gunbuster mecha. if you want a 80s feel with a bit of retroness (due to the retro designs of the mecha) this is one to watch Bubblegum Crisis series I can't beleive this one isn't put up. Bubblegum crisis is another pinnacle of how to do Cyberpunk right. Bubblegum crisis talks about the knight sabers a mercenary group hunting down boomers (think terminator like robots with bio mechanical stuff) I recommend giving the original OVA a look along with 2040, A.D. Police (80s ova not the series), crash, and parasite dolls. Cyber City oedo 808 another good cyberpunk series sadly it's a short 3 episode OVA. this anime talks about prisoners doing police work that the ordinary cops can't do. Starship troopers OVA. Yes. japan made a OVA based on StarShip Troopers and yes minus a few things this one stays true to the actual book. The anime covers 6 of the 12 chapters in the book and sadly they didn't have money to finish the other 6 chapters. I would of love how this would completely turn out ,but still this one you should give it a watch,but sadly it was only released on laser disk so i recommend torrenting a fansub (which is really good and not shitty and fill with shitty moving text like a few known anime fansubs) or checking out on youtube with someone posting the fansub on there