Gundam Iron Blooded Orphans (I haven't seen other Gundam so idk how this fits in).
It's standalone. Like half the Gundams are standalone (or just have 2-3 seasons with the same cast) and the other half is tied together in the UC timeline.
https://imgur.com/LabbRyN
raytan
and Kana are on opposite ends of the Awesome Spectrum.