I just got this game half an hour ago, and my PB for time attack 1 is 26.33. I see WR is 10 seconds better and I don't understand how. Is there something you unlock later?

yes, you unlock some skins that give you extra powers!

The fastest time is even faster though. (ie. Ninja WR is ~10s, wheras the Qbby one is ~16s) I know when I first played this game my times were quite a lot slower. It was only once I had played the game a lot more that I was able to drop my times down a bit. There are plenty of techniques you can do to make yourself get faster times. If you watch any of the videos that are up (eg. http://www.speedrun.com/run/wzp4dovz) you can get some of an idea. For the most part it is down to doing the level quite a few times and really knowing the route.