Asriel Dreemurr

Asriel Dreemurr is the biological son of Toriel and Asgore and Chara's half-brother. He acts like a gentle and sometimes crying child. He died while carrying Chara's body to the people. He was about 15 years old at the time of his death. At Asgore's request, Dr. Alphys tried to revive him, but he became a soulless flower Flowey. After so many battles and meeting new friends, you managed to make him normal again, as well as his sister Char (don't ask how). But now they look the same as when they first met (which is about 6-10 years old). After Toriel and Asgore made peace, they began to take care of their children again. You, Frisk (aka the main character), decided to visit him.