Mind telling me the most interesting character of all in fairy Tail? If u have more than one answer, u can tell me those also!

Is Natsu more powerful than Gray? Cause everyone keeps comparing gray and natsu as equals in the series, like Carla, Happy, and other members. So are there power and skill levels around the same or is one stronger than another?

So how do Jude (Lucy's father and Layla's husband) and Anna (Lucy and Layla's ancestor) both have the same last name? I'm rewatching the series right now after dropping it years ago, so if it revolves around something spoilery please just tell me that.

Can Natsu use Fire Dragon King Mode at will?

Is Laxus stronger than Gildarts or Natsu? I feel like Natsu's a bit inconsistent.

Can Natsu defeat a 5th gen dragon slayer?