[Oni]

I quite liked Mushishi - Though I'm not sure if that's considered mainstream or not? Depends on how mainstream is mainstream to you xD

I also liked Blood+, Bakumatsu Kikansetsu Ironhanihoheto, Knights of Sidonia and Gargantia on the Verduous Planet. Those are semi well-known, especially the Netflix ones. But I found them a little different.

What shows are you most fond of? I'd be able to make better recommendations of the more obscure shows if I knew your preferences.

Thank you, i'v been looking for some mecha anime to watch. this helps a lot

Have you seen Full Metal Panic? It's pretty good for an older one.