Duo is our mascot. The only thing he loves more than Duolingo is seeing our learners succeed. He's their #1 fan and biggest cheerleader. He's also very persistent. Duo isn't shy about checking in or laying on a guilt trip. He's like a parent: you never want to disappoint Duo. The shame is real...and very effective for open rates and retention. Duo is social, a great communicator, and rather emotional. In a word, Duo is extra. And people love him for it.
Duo's voice is just like Duolingo's: expressive, playful, embracing, and worldly. He's just more of it.
When does Duo talk? Well, he never actually talks — he communicates via text:
Contrary to popular opinion, Duo isn't out to get you. (We leave that to the memes.) He's just out to get you back on Duolingo.
We all know when our friends are acting strange. That's why it's important to make sure Duo always stays in character.