Fighter - Knight-Alchemist
The Knight-Alchemist is a fighter who knows their own physical abilities - and has zero compunction about using science to bypass them.
This is the 1.0 of my Knight-Alchemist subclass! It's a riff on the mutagen warrior concept, a fighter focused on augmenting their own abilities by brewing custom potions. The key feature is concoctions: potions you prepare after a long rest, which you can chug as the situation requires. This results in a fighter with a bit of a Vancian flavor to it - you judge after your rest what concoctions you'll need, and deploy them as needed through the day. It's deliberately a little more long-rest oriented, because it needs that feeling of preparing in advance for your day; the major touchstones here are the Witcher, Dr. Jekyll and Mr. Hyde, and older editions' Vancian casters.
As always, you're invited to come discuss and offer feedback on Discord!