After all the novels I've seen, my standards have gotten pretty low...all I want these days is for an author to just...talk normally. >_< Like, if it's a first person POV, just say normal things that would actually likely be part of someone's stream of consciousness. Not "Hi. I'm MC. I'm an average/above-average/below-average teen with lots of/very few friends and excellent/terrible grades, or somehow all of these things at once. Before we jump into the plot, here's a detailed description of my hair and what I'm wearing that no one in their right mind would ever care about...!"
...You'd be surprised how often people do that. ╯︿╰ I know it's easier than starting with a thought process and/or situation that exemplifies the character and shows off their core qualities in a way that makes them apparent through their way of speaking and their actions (which is what I would ACTUALLY recommend doing)...
...but most people don't open a novel looking for a character bio. They want a story, and they want it to be clear that you can make your characters part of the story, not "accessories" that have to be explained separately.
A 'preview' could definitely work if you do it right. Like the most obvious strategy: "It's a dark and stormy night, and I'm running for my life from a hideous monster...and I bet you're wondering how I got here. Well, here's how it started..."
Obviously, don't actually write something that cheesy (or that short...). ^^; The point is to start from a suspenseful part, 'flash back' to the beginning of the story, and then write normally until you actually get there.
Or if this is a story where characters can have dreams or visions of the future, start with one of those. Foreshadow future events and characters...have fun with it~