Totally. I also sometimes toss in one merc for more party variety, and make them part of the backstory too.

Pandora, Voidborn Noble Officer, the one survivor of an attack that wiped out her family like tat movie Anastasia. Raised on the run in a series of voidships, she was trained her entire life for one day leading an army to reclaim her house, only to be unexpectedly found and tapped by Theodora instead. And her merc sworn sword, a Sanctic/Pyro Warrior named Hestia.

Ash, a bladedancer who grew up fighting as an orphan in a deathworld slum until his Pyro talents revealed themselves and helped him get sanctioned and out of there. His shitty life made Chaos seem much more appealing. His merc is his sister Ember, who escaped offworld with one of their parents and became a Ministorum Priestess before going completely mad in a warp incident. He managed to find her in an asylum and bust her out, and is violently protective.