Maybe there's a character like Lily. She could be an ordinary girl who accidentally stumbles upon a time - switching mechanism. Throughout the story, she has to learn how to navigate different time zones, meet different people from various historical periods, and in the process, she changes and grows as a person. This character would add an element of relatability for readers as she starts off as an average person in extraordinary circumstances.
Another possible character could be a time - traveling thief named Jack. He uses his ability to switch gears in time to steal valuable artifacts from different eras. However, as the story progresses, he might have a change of heart when he realizes the impact of his actions on the timeline and starts to use his skills for good instead.