My first impression: they all need a hug, I'm not into men, but they all need a hug this instant. And Arha needs all of the hugs.
Suiza probably has the most painful backstory, I guess. With Tai being close second in that regard. But Kien looks so sweet and the most empathetic so far.
So uh. I can't pick.
I'm most curious about Suiza, I think, so I'll pick him for my first route.
P.S. What are you doing to me, I have no interest in F+M romances whatsoever, but I know how engaging your storylines can be and *fangirl squealing noises!!!!*