Roo most likely won't get a free hit at all; Kerrigans Psionic Storm will kill him before he hops his way over. It doesn't target him, but it most certainly kills him. This same Pisonic Storm will at worst bring Cielo's speed shenanigans to a halt (if only temporarily), an will also heavily hurt him (along with everyone else on other team).
On the ground side, Diablo/Dracula are more than a match for Gene and Agahnim - Especially with Fortune firing her railgun out of the gate.
Grabner may not have the giant area of effect spell like Kerrigan to assuredly hit Cielo, but he definitely can. His machine guns fires at 3000 bullets/minute, which even aiming randomly forces Cielo to fly evasively, and in places like Tick Tock Clock this is "not good" for him.
Athos is kinda the floater here, I'm not sure if he'll be trying to nuke from the back rows - Can he fly? Thats not typically something people in Fire Emblem can do, so I'm honestly not sure. Regardless, you can lump him in with either Cielo or Gene/Agahnim and the same result applies.
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Now with more bold! Less Italics due to bold