Honestly, I used to think Paper Mario and Captain Toad had a higher chance than Daisy, but now, I think otherwise. Think about it.
Although PM and CT have had major roles and have appeared in more important games, the GENDER of a character plays a major role in whether they will be DLC or not. I really don't think they're going to do all male DLC.
Here's how it may go:
Mewtwo - April (already confirmed)
Lucas - June (already confirmed)
Wolf - August (very high chance due to his position in the chart)
Unknown character - November or December
Who will this unknown character be? I doubt it will be a male character because well honestly I just really don't feel like it will be a male. They already have 3 male DLC characters, so it just has to be a female. I hope I'm not the only one who feels this way.
Possible female candidates:
Bayonetta - Requested by many, but she is a third party, and honestly I really don't see her getting in because she is quite inappropriate. I know they had Snake in Brawl, but Bayonetta is a voluptuous, angel-killing witch from Hell. So that's 2 issues: she may be too sexual (design-wise), and because of possible religious controversy. And besides, didn't Bayonetta's creator himself say he didn't want her in Smash?
Shantae - Requested by many, especially on Tumblr, but like Bayonetta, she is a third party. I'm not saying third parties have 0 chance, but to me, they have a low chance. I don't think Nintendo would do third parties as DLC as it would be more time consuming, possibly. Also, just look at her. Her outfit is quite skimpy, only including pants and a small bra (even her other costumes in the game are very revealing and skimpy, showing her cleavage.)
Dixie Kong - She is being requesting by soooo many people!! They want her because they need another DK rep, apparently. But honestly, I really don't want her to be DLC.. she may be cute, but to me, she ain't that cool. And it's kind of hypocritical for people to say Daisy is a Peach clone when Dixie can be seen as a Diddy clone. You may say, "But Dixie has her own unique abilities featured in DK Country 2 and 3!" Yeah well the same can be said for Daisy. She can represent the Mario spinoffs and Super Mario Land. And besides, is Dixie even that popular?? I know this is a bad example, but if you go on DeviantART and search for "Princess Daisy" you get over 24,000 fan art pictures. Search for "Dixie Kong" and you get only over 2,000.
Impa - She's pretty cool.. but honestly, while Impa is widely recognized by hardcore gamers and in-touch Nintendo fans, she really isn't recognized by the casual audience. Casual video game players tend to buy more simple games like Mario spinoff games, Pokemon, and maybe Sonic instead of games like Zelda or Xenoblade or Fire Emblem (I'm not trying to hate here, I really love the Zelda series, especially Wind Waker and Twilight Princess. OH and Ocarina of Time). And honestly, I'd rather have Midna as playable than Impa, but sadly Midna is already an Assist... To me, Midna seems more major, being Link's guide for the entirety of Twilight Princess, a very popular Zelda game. Impa is just a recurring sage in the Zelda games. OH and sorry for using the DeviantART example again, but if you search "Midna" on DeviantART, you get over 63,900 fan art pictures, while searching for Impa will only result in over "5,800" results. Shows how much popular Midna is.
Daisy - the one I think has the highest chance. Although being simply a spinoff character, she can represent the Mario spinoffs themselves, using Mario Party and Mario Kart attacks. She has a great amount of fans, but I noticed that she is loved by the casual audience but hated by the more hardcore/in-touch audience. She also has more female fans than male fans. I think a female DLC such as her will get a high amount of sales. Also, even though Mario already has the most reps, it is the most popular series out of all the franchise, especially because Mario games are purchased by not only hardcore gamers, but by the casual audience as well.
So, in conclusion, I think Daisy has a high chance of becoming DLC because she is a well known female character compared to the others, and is from the most prominent, best selling game series, so I'm sure that a Mario DLC character will get a high amount of sales.
Whoo I think I practically wrote an essay right there! I wish I felt the same way when writing for school essays and assignments. LOL