I was hoping someone could help me flesh out my idea for a homebrew race, They're called the Ferris, they're metallic humanoids that live and grow underground.
the backstory behind them is that they lived in seclusion until their home was discovered by a dwarven mining team, at which point they spread across the world.
at this point, all I've come up with is that they would get a bonus to con, and (possibly) resistance to certain types of damage depending on their subrace, which would be based off of various metals and alloys.

Here’s some things I’d like to know about them to get you started. What kind of personalities do you think they usually have? Quiet or outgoing, idealistic or practical, emotional or logical, adaptable or steadfast? Do they tend to be good or neutral? Lawful or chaotic? How polished or crude is their society? What kind of government do they have? What religions might they follow? What craft are they especially good at (this might lead you to a bonus proficiency)?

Good luck!