As the name suggests, Dark Pit was created as a rival clone against the real Pit. Where the real Pit is so cheerful, humourous, and playful, Dark Pit is the EXACT polar opposite. He has a strict no-nonsense personality, tends to become pretty selfish, and always wants to have things done his own way. Dark Pit is stubborn and absolutely HATES being bossed around by others and doesn't care if they're the boss they're supposed to be or not. The bottom line is, Dark Pit works for nobody, and I mean, NOBODY but himself! Well, at least that USED to be him. Throughout the Kid Icarus Uprising video game, he learns that his life is still genetically connected to the real Pit's life, and he begins to understand that no matter how many times he fights with Pit, he STILL is his doppelganger in the end! And because of this realization, Dark Pit's relationship with the real Pit has grown much healthier, and they occasionally work really well as a team together! Although Dark Pit STILL has his no-nonsense attitude and can still be a bit of a jerk at times, his personality has definitely grown better since his first arrival in the underworld, and that's what matters the most!

(For Dark Pit's voice, I want his to sound similar or identical to the voice he has in the Kid Icarus video games provided by Antony Del Rio. Here are some voice clips for reference!)

https://youtu.be/Ao9G2R61jv8?t=2