I doubt I'll ever add this as a mode to the Dr. Gaster Ukagaka/Ghost because it'd be a ridiculous amount of work for him and I already have a long list of stuff I want to add to him already, but it's fun to speculate. Speculating about ghost features is the most fun part of ghost making actually, haha.
Anyway, he'd never be comfortable with petting, but he'd like small gifts and puzzles and things like that. It'd be hard to get him to open up or talk to you, he's pretty awkward. Punching him would irreparably destroy your relationship with him, but I don't think I'd implement that as a feature for the same reason I don't want to add it to the brothers.
他不会喜欢抚摸，但他喜欢小礼物和谜题或诸如此类的东西。让他对你敞开心胸或者让他和你说话会很困难，他真难对付。打他会给你和他的关系带来不可逆转的破坏，但我不会做这个桌宠，理由和我不会做骨兄弟的桌宠的理由一样。
