This might sound really weird, but I'll tell you how I do it... 
You know the old Scooby Doo show from the sixties/seventies? The old one, with the goofy villains and the celebrity guest stars? Remember watching the gang walking together with Shaggy, Scooby, Fred, Daphne, and Velma?
Each of the roommates in Apparent Secrets was assigned one of their walk cycles. No joke.
When I'm writing for Byxx, I think of Fred, confidently walking with broad chest and big strides, pumping his arms for speed. When it's Khazmine's turn, she swivels like Daphne. Zayzann bobs and sways like Shaggy. Iris is careful and closed off like Velma, only looking at what's directly in front of her.
When it's time to write for one of the roommate's POV, I'll take a lap around my place like the character would. It puts me in the same headspace as the character, and I write more organically with their style and rhythm in mind. I hope that helps. 