I Think Color And Dream Would Be Very Close. Or At The Very Least Have A Mutual Understanding Of Each

I think Color and dream would be very close. Or at the very least have a mutual understanding of each other due to their very similar circumstances surrounding their past and personalities. The two have both lost their siblings and their world to a horror beyond their comprehension; they are forced to fight and have lost memories because of this. No one in othertale will know about sans because his entire existence was wiped out after a reset, and no one ever got to know the real dream due to his abuse at the hands of villagers, making him out to a person who’s all smiles, never struggles with his mental health, and HAS to be the reason why others are happy/kept happy. The only person who really knew dream was passive, and he died unaware of the abuse dream was going through as well. Dream and Color both lost their worlds and their history. Dreamtale is nothing more than dead grass, a tree stump and mindless, rabid, negativity filled villagers; No one knows it’s story except for Dream because the corruption can barely remember passive’s memories. Othertale never had a sans (or a gaster) and it’ll be kept that way forever. 

What do color and dream do in response? They bury themselves in their work, helping others achieve happiness while continuing to neglect their own. They are both different ends of a spectrem on how they allow themselves to be treated as doormats. Dream always forsakes his own health for others and keeps himself in isolation out of fear of his aura affecting someone, manipulating them into friendship. Worse, they get addicted or become a victim of corrupted nightmare. He believes he has to be the reason why others are happy and will tear himself in two if it meant the safety of someone else (-1000 self preservation skills).

Color on the other hand doesn’t bend backward and fall to the calls of others like Dream, but still puts himself into dangerous circumstances to the point he becomes obsessed with fixing all of it. Killer is an example as he KNOWS how dangerous trying to get him is, but seemingly dedicates his life to saving killer despite the risks. It doesn’t help that just like dream, he has internal forces that make him more likely to do things like this (specifically the soul traits). Color would good and well die for killer and they both know it. Of course killer doesn’t fully understand but it’s just the way color is.

And of course, they bottle up their emotions to age them like fine wine. They’d have their limb chewed off but the moment they see someone else injured it’s like their wound was just them getting nipped by a puppy. Dream would apologize for not healing them sooner and Color would just outright ignore or hide the injury in an attempt to heal whoevers hurt. Emotionally they’re closed off as well. Color isn’t going to say how he’s feeling (-1000 for being a sans too so he’s not going to budge), and dream would rather deepthroat a cactus before stating how he feels. 

it's just kind of sad that they'd get along with each other so well but it's really because of how they treat themselves and others.