Asriel Dreemurr is a character from the 2015 game "Undertale". He was created by Toby Fox.
Asriel is the child of King Toriel and Queen Asgore Dreemurr, but he seemingly passed away prior to the games events. His back story is only focused on in the True Pacifist Route, which means the player does not kill a single character. As a young child, he was a close friend of Chara, a human child that fell down into the Underground and was adopted by the Dreemurrs. As Chara died, Asriel carried their lifeless body up to the human world, but was killed, for the humans thought that it was Asriel who killed Chara.
In a major plot twist in the True Pacifist Route, it is revealed that the antagonist Flowey is in fact a reincarnation of Asriel Dreemurr. When Asriel was killed, his soul was destroyed, yet his determination moved into a nearby flower which came to life. However, in this form he lacked any sympathy and emotion. As Flowey absorbed the souls of all the monsters of the Underground, he transformed back to Asriel, who serves as the True Pacifist Route's final boss.
In the Genocide Route, Asriel is never mentioned, and Flowey is not given that much of a back story, except for a hint at a closer relationship with Chara. While Asriel's back story is told in the Neutral Route, no connection between him and Flowey is made.
Despite being cruel and emotionally cold as Flowey, Asriel is a kind and sensitive person when having a soul. He was a brave and trusting child who tried the best to fulfill his best friend's final wish. Even during the final boss fight against Frisk in the True Pacifist Route, this personality shines through. It becomes clear that the true reason for his attacks is being afraid of losing Frisk's company if they win, and of being lonely again, and even breaks out in tears. In the end, Asriel realizes the bad he has done as Flowey and seems to actually have very peaceful views.
Asriel's physical appearance bears a strong resemblence to that of an anthropomorphic goat, even though he seems to have fangs. Apart from his form as Flowey, he has three different forms in the game: his child form, his regular adult/adolescent form and a final form. Only in the latter, he has wings.
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