Right off the bat Miah may be a tad hesitance to talk to him, mostly because his track record with therapists kind of sucks. But the guy could seriously use some kind of counseling.
Zach I think wouldn't be against talking to him, but he's also in denial of the fact he could use some counseling of some sort. But I would imagine if Toby spends any time around the infirmary that the two at least know of each other. And who knows, maybe they could talk while Zach's hanging out in quarantine after he's bitten?
And Regan is probably my one character who would willingly seek Toby out. He's still struggling hardcore with Soli's death.
I think Nick probably knows Emma and Elisa since she hangs around the daycare some, so in that way I'm sure she's at least aware of Toby.
Vienna and April are kind of wild cards when to how they may react to Toby. But like Mandy said, Bea and Vienna have their days when they could use some serious family counseling, lol.