my personal additions :] Tyzias is VERY low on the vocal range. Not exactly masculine, but definitely masculine for a girl. Tegiri sounds like he's tryin REALLY HARD to sound like an anime character, but fails miserably. He also has a fairly low voice. Your Marvus hc is so on point it's scary. but he's definitely got a bit more of a Boston accent in my mind, and a lot gravellier. NSFW Lanque sounds exactly like SFW Lanque, but much lower and sultry. He just in general sounds like a feminine guy. Stelsa is LOUD and very feminine. she definitely whistles her S's sometimes. Remele is very middle-of-the road when it comes to vocals. Not to masculine, not too feminine. Naturally, there's also the unmistakable French accent.
Marvus with his voice. I see it sounding like Adam Lambert, Brendan Urie(correct me if I spelled it wrong) or the guy who wrote and Arcadia(Smash Into Pieces) and Chixie, I see her sounding like the girl who sang "this ain't build a b!tch (a b!tch)"
7:32 Something about this being from before Stephen split off to make his own channel makes me kinda uncomfy, ngl. His voice works well for Zebruh though.
I get that feeling too when I rewatch this from time to time - the audio is from Stephen and Dan pranking Hosuh, but damn - it aged like fine wine or milk depending on your point of view