(At least my headcanon on how they look like? Aside from Phosis T'Kar, no one really have any official physical appearance described in the lore.)
Update: I am a fraud, turns out H.M was blonde. But let that slide...
Khalopis (Pyrae) & Ahzek Ahriman (Corvidae)
Phosis T'Kar (Raptora) & Hathor Maat (Pavoni)
Aqhet Hakoris (Aquilae) & Baleq Uthizzar (Athanaean)
Did you know? Aquilae cult was never formally formed because they specifically dwell into Warp research, and the members was scattered through the legion by Magnus because the research was deemed too dangerous.
Lastly...
The babygirl Crimson King himself -`โกยด-, smiling gently at you.
Q: Hey MsFlora, why are they shirtless? A: I like sexy men.