With all this hullabaloo about King K Rool today, I want to bring up something people have discussed about King K Rool but not Daisy: their recent trademarks.
http://www.nintendo.com/games/detail/jajEV0wKLk8iyMOzYOzF06L0jEhFsUqo
Here, we can see that Daisy has been trademarked (heck, even called a "fan favorite"), although for a spinoff title.
King K Rool was also trademarked recently in a title that's also probably a spinoff: Donkey Kong: Jungle Climber, a DS title for the Wii U Virtual Console.
http://www.nintendo.com/games/detail/Xa0YAXm9S_tEzs80av_qC7c-U5HyY_uQ
Now, on both the page for DK:JC on the original DS and the Wii U Virtual Console page for DK64, K Rool wasn't trademarked. But now he is trademarked, and has a Mii Fighter costume for Smash!
Basically, my point is that K Rool was trademarked recently, and now he is going to appear in Smash (hopefully as a fighter in addition to the Mii Fighter costume). Daisy was trademarked for some odd reason; should we expect anything?
Sorry for the possible straw-grasping/false correlation, but I haven't seen people talk about this.