Light Yagami/Harry Potter
In some ways, Light was adjusting well to his new life. He knew his new age and birthday, courtesy of his aunt and uncle whispering in hearing distance whether they should do something special for his birthday. They didn't, but Light forgave them because now he knew what age he should act as.
In others, Light failed spectacularly. Hence the conversation he was being forced to listen to.
"My sister's son is a bit special," Petunia told her neighbors over cake and orange juice. "He doesn't speak, just gestures. He doesn't play with anyone except Dudley. Too shy, too behind his development. We're trying our best but doctors say it's the trauma from the car accident his parents died in."
Two truths, three lies. Light is a special child because he is a genius. He forgot to speak in the 18 months he had been here and that was his mistake, sure. He doesn't play with anyone, including Dudley. Dudley, Light humors. Light isn't shy nor behind his development, there were no doctors involved and Vernon and Petunia never even tried making him speak. They talked at him, not to him.
Petunia was an amazing liar in a way only abusers trying to white wash themselves were. Light was reluctantly impressed.