[@Not Fishing]
Loads of factions have multiple characters.
My own company has several characters, one of the GM's origin. But they all follow a general force.

Mine being the Steel Fist.
But house Blackwell for example has several characters that all further the goals of the house.
ZB1996 has several factions he runs, the church and the church separatists, which both have several characters and goals.

I'd say it's fine to have several characters, as long as it's not a ridiculous amount.

As for dwarves i'm sure Duncan will say nope.
Since dwarves went extinct.... a long time ago. Like "checking timeline".
1500 ish years ago.
But if you have a cool idea, several characters have gotten hold of dwarven steel gear, if it is that you are after.

I myself have a character in my mercenary companies backstory who was nicknamed 'the dwarf', but that is just a joke. Since he was actually a giant of a man.
But, Duncan of course has final say.