Then there is Full Metal Panic! (the ! is an important part of spelling the title)
For me personally I do like mecha like Code Geass or Gundam.
But one of the best has to be Evangelion.
But I'm watching Total Elcispe right now which is half decent.
Picking off a Top 5 for mecha anime for me, let's see:
Callum Petch says goodbye to Screened by fondly reflecting on the site that gave him so much.
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