i could talk about the parallels between the dreemurr siblings and the skeleton brothers and how one is more reserved and is closely related to your choices and willing to make the hard choices that their brothers can't while the other is more energetic and refuses to kill even in the face of certain death and is closely tied to belief and hope and how both are so extremely codependent and how the dreemurrs were doomed because of it but the skeletons avoid their fate

but instead i'll just say that chara and sans are joined in "my brother is the coolest" solidarity