Tails is very friendly and quite humble. He generally lacks confidence, but is always capable when Sonic's around. He is also very intelligent, is a mechanical genius, and an expert pilot. Although he was content with just being a sidekick in early games, he has shown a longing to become more independent in Sonic Adventure, and he's proven his worth after defeating Dr. Eggman's walker in the same game.

He also has a tendency to talk a lot, down to the point where Sonic may start ignoring him, much to Tails's annoyance. Sometimes, he talks so much that he may accidentally blurt out secrets or plans. He also annoys others with his overuse of "technobabble", which usually frustrates those around him, especially Knuckles.