Illumi is my shipchild between Dream Sans and Reaper Sans.
Illumi was created sometime after Reaper and Dream got together. She was mostly cared for by Dream due to Reaper being busy with his role as death though Illumi always was interested with Reaper. Due to Nightmare being an active threat to both Dream and Illumi, she can't go many places without either of her parents. If she is alone in an AU she wears a veil as an attempt to hide her identity. Illumi mostly goes around the mulitiverse helping Dream or will join up with her uncle, Reaper Papyrus, to help those who die peacefully.
Illumi is very friendly towards others but also makes sure to not trust right away. It's a thing she was taught about to be protected from someone like Nightmare finding someone to take her. She finds those who act mysterious interesting as it reminds her of Reaper when she was younger.
Illumi has small healing powers that aren't as strong as Dream but also rely on positivity for them to work. She is also less powerful depending on the amount of negativity in an AU which is shown by her eye lights. She has a small bit of Reaper's death touch but it is very easy for her to control.
I've been reading xXtha's Dream and Reaper comics to much and ended up making her
Speedpaint:












