Tails is a gentle-hearted, sweet-natured and loyal fox with a positive attitude. In the beginning, he was timid and quiet, but he has opened up and become more outgoing over the years. Tails is not one to grab the spotlight for himself and, instead, is always ready and willing help others without asking for anything in return.

Tails has a distinct love for mechanics and he finds himself most at home in his workshop working on his next creation. Despite his great skills, Tails is very humble about his abilities, never giving them many thoughts, though he has yet to discover his true potential of what he can accomplish. Although in recent times, Tails has become more confident and outspoken about his intelligence, though he still does not openly brag. Regardless, he has been known to mock Eggman's own creations, and sometimes Eggman himself.

Although in the current IDW run, he has shown the ability to be quite sassy and sarcastic in front of Sonic.

So for Tails you can base yourself on his past incarnations or have your own spin, as long as he sounds like a little smart alec preteen.