“He presents himself as having a strong sense of justice, disapproving of the Phantom Thieves of Hearts for their methods. He is candid in expressing his disagreement, but he wants to hear about other people's views in an honest fashion.This cheery disposition, however, is nothing short of a fraud that has been carefully crafted to grant him a public image and mask his real personality. Due to having been born an illegitimate child, he would be despised by others as he would be nothing more than a scandal for them, even ruining his mother's life and driving her to suicide. He would subsequently be placed into child institutions. Akechi grew up a lonely child and a "nobody" who yearned to be loved; this feeling persisted into his teenage years. The stigma of being an illegitimate child, while also heavily implied to be an impulsive mistake on Shido's part, has haunted Akechi and become the basis of his incredibly misanthropic worldview as well as his legitimate self-loathing. Regardless of how much Akechi tried to change, that hatred that bound him to his past would persist deeply.” - Persona 5 Wiki

Voice Examples

https://www.youtube.com/watch?v=ehMX8YJrj8k

https://www.youtube.com/watch?v=72J5XhgnJ9I