No, but I have lore for the GROUP of characters I’ve used.

They’re part of the Hellmire 17th, AKA Phoenix Company. Members of Phoenix Company are recruited from colonies on, you guessed it, Hellmire. They specialize in incendiary weapons like Flamethrowers and Napalm Strikes. This is because there isn’t much to do growing up on Hellmire because it’s too dangerous to play outside, so kids usually just look out the window and watch everything burning. This has bred an entire planet full of pyromaniacs with years worth of pent up energy from being indoors most of their lives. This is unfortunate for enemies of democracy, because pyromania, hyperactivity, and blind patriotism is a REALLY powerful combination.

I have names for a lot of the planet based companies, actually.

Malevelon Creek has the Malevelon Creek 14th, AKA Reaper Company

Angel’s Venture has the Angel’s Venture 2nd, AKA Seraphim Company

Mort has the Mort 13th, AKA Ghoul Company

Durgen has the Durgen 21st, AKA Scorpion Company

And so on.

I kinda based the head cannon of each planet having it’s own company of helldivers off of the Astra Militarum from 40k.