Well, since we had one for normal robots I figured this might be appropriate! Not really going to define mecha and leave it more general, use your judgement. To me it means generally large semi-humanoid semi-mechanical. Anime or game, east or west, just want to see people’s favorite big robots.
Post pictures if you can! Mecha are, generally, about the visuals, so a picture over just a name/description might be best.
Most of my favorite mecha are from Mobile Suit Gundam, my favorite designers are Ippei Gyoubu, Kenki Fujioka, and Kazumi Fujita!
An Ippei example, a Fujioka example, and Fujita example, for my favorites!