Sans- Crouches down to be more their level since they’re probably a bit shorter than him. He’ll ask where their parents are, and when he figures out that this child has obviously been left here, he’ll tell them he’s gonna take them to the police, and they’ll help find their parents.
Papyrus- Pats their head gently, and asks where their mommy, and daddy are. When he realizes the child has be left here on purpose he’ll crouch down to be closer to their height. He’ll pat their head again, and tell them softly, that he’ll take them to someone who will help them find their parents. Once he’s done that he’ll ask to be kept updated on their status to make sure they’re okay.
Blue- Is a police officer, so he probably found them on patrol. He’s a bit concerned that he can’t seem to locate their parents until he learns that they’ve been probably been abandoned here. He takes them to the station where he calls CPS.
Stretch- He’s a bit at a loss on what to do since it’s obvious this kid has been dumped here, but he feels really awkward around kids. Eventually he calls his brother, who comes and deals with the situation, but he’ll be asking Blue later what happened to the kid.
Edge- Despite what some people might think, Edge likes kids. He thinks they’re just innocent curiosity that hasn’t been corrupted by the world just yet. He'll get down on their level, a little worried he might scare them with his face, but do his best anyway not to, and lower his volume. He'll tell them they're alright, pat their head remembering when Red would do that for him, and that he'll help find their parents.
Red- In the beginning he tries to pretend he didn't see them, but about 5 steps into walking away, he curses, and turns around. Red stomps down the alley to ask the kid where their parents are. Figuring out quickly that they've been abandoned, he takes their hand to take them to the police saying to follow him, and that they're gonna find a police officer who'll find their parents.
Berry- He's immediately concerned, and crouches down to ask if they're alright. He's quick to realize they've been abandoned, and he's furious. Who abandons their child? He goes through the steps of contacting authorities, but unlike the others he keeps updated on the kid, and when he finds out that they've been sent to foster care he immediately tries to foster them. He figures, maybe a friendly face the child knows even a little will make things easier. Plus, Berry has always wanted a family, and to be a father, and this child needs a family which he's willing to provide.
Money- He’ll do his best to make them laugh. This is a scary situation for them, and he’s trying to make them feel less afraid as he takes them to the police. He’ll definitely stop along the way to get them some ice cream, hoping that it’ll help them feel just a little less afraid, and calm.
Black- Immediately softens, and lowers his tone to something more gentle as he bends down placing his hands on his knees. He’ll ask them first if they’re alright, before easily realizing they’ve been abandoned. Patting their head, he’ll tell them it’s okay with a smile, hoping his teeth does scare them before helping to take them to the authorities.
Rus- Is completely lost on what to do. It also doesn’t help that he’s completely stone-faced, and looks like he’s half comatose most of the time. He definitely wants to help this kid though. No one deserves to be abandoned, and he’ll do his best even if he comes off stuttery, and an idiot as he does.
Bear- Without a doubt, probably scares the kid even more accidentally. His face just does that. He’ll apologize softly, and despite how creaky his legs are, crouch down through the ache to be a little smaller. He’ll tell them they’re alright, that he’s not gonna hurt them. He’s just gonna help them find their parents.
Sparrow- Is good with kids, he is a second grade teacher after all. He’ll help make the kid feel calmer, and get them smiling again as he tries to figure out where their parents are. As well as if they’re alright.
Wine- Tells them it’s alright, and that he’ll make sure they’re taken care of. No one’s going to hurt them. He awkwardly ruffles their hair, and does his best to make them feel more comfortable, but he’s better at dealing adults than he is children. This will bring out his mothering side though, and he’ll want to make sure they child finds a proper home.
Coffee- Has no idea what to do, so he gets Wine, but for some reason the child has attached himself to Coffee as people normally do. He’s got a soft, sweet aura to him that allows people to feel less anxious. This child isn’t going to want to let go for a while.