Flowey is one of the first major characters we meet in Horrortale.
In the game, he is only grey, expect for his green eye. However, in the comics, he is usually drawn with yellow petals, and green stem. He has only one big green eye, which covers most of his face. His petals are more pointed. He also doesn't have a mouth. It is unclear how he talks to Aliza.
In the comic, Flowey is the first character Aliza will encounter. He will try to act friendly. Then he will say that neither of them want to stay at ruins. Then Toriel burns him to ash. Aliza will take the ash, and put it in the pot. Then she pours a bottle on him, which she finds in the secret hatch in Toriel's kitchen, and he came back to life.
He says that Toriel will hurt her. Aliza decides to trust and save Flowey, which results in Toriel poisoning her. Then she has hallucinations of Flowey convincing her to kill Toriel. Flowey gives her the bottle. She drinks out of it, gets rid of the poison, and tries to run away with Flowey in her hands. Then she escapes The Ruins and leaves Flowey behind.
She meets him again in the Snowdin forest, after she freezes in fear. He says that he avoids the same thing Sans is escaping from. Then he explains what are the skeletons like.
Aliza-He seems to care about her a lot. He also gives her advice. You could say, that Flowey is Aliza's only friend in the underground.