““He frowned at them. “Is… is the Flowey of your world a jerk?” 

Frisk considered it. “Well, let’s just say he wouldn’t have been out of place in this world.” 

Flowey scoffed, turning away. “Heh. Of course. He probably would be just fine, wouldn’t he? He wouldn’t be like me. Some crybaby who dies all the time.” 

Frowning, Frisk sat up and reached for Flowey, forcing him to turn and look up at them. “The Flowey of my world stopped caring about others. He was a firm believer in ‘kill or be killed’ in a world where that was the farthest thing from the truth. He hurt others because it was the only thing he had left to amuse him. He is not better than you because of that. He was misguided and he changed his ways. He became kinder. But you? You’re already kind.” They smiled at him. “You’re more like how he used to be. Someone he might want to be more like now even. Don’t compare yourself to him.” They paused and leaned down to press a kiss to his petals. “Kindness is not a weakness, Flowey.””

~ Ch. 10, The World, Upside Down by @last-haven (on Ao3)