It's about a shapeshifter. Not your usual, "they can turn into animal(s)" or "can become whoever they want" shapeshifter. No.

This shapeshifter uses their knowledge of biology (from their past life) to manufacture stuff using their body.

I've seen and read so many stories with shapeshifters in my years and I always wondered, "if they can change their body however they want, why can't they just make shit with it?" Hehe.

I mean, imagine how cool it would be if you could pop an entire set of bone keycaps off your arm? Complete with enamel or nacre (mother of pearl) coatings.

My story is fantasy isekai, so keycaps aren't going to be a thing, but I thought it was a good way to demonstrate what I'm talking about.

This character unlocks a whole lot of skills that let them produce just about anything that an animal can produce and shape these objects (if they're solid; no need to shape oil or poison, hehe). Ultimately, they also end up unlocking a skill that lets them shapeshift other people—which probably sounds overpowered—but shapeshifting isn't exactly the fastest skill, hehe. Not early in the story anyway.

It's a comedy, though!

The MC joins up with some other folks and one of them—a [Warrior]—ends up with the [Hot Rod] subclass because the MC is constantly tinkering with her biology.