Now, the Trophy Theory.
During the April Nintendo Direct in 2014, four trophies were displayed.
Tiki from Fire Emblem,
Fi from The Legend of Zelda,
Pseudo-Palutena from Kid Icarus, and
King Kihunter from Metroid.
People have speculated these four trophies to hint towards four newcomers from the corresponding series. An example is
this outdated image. Since then, Chrom has been disconfirmed while Lucina and Robin are newcomers.
Evidence for this theory comes not only from the confirmed newcomers Robin, Lucina and Palutena, but also from the relationships these trophy characters have to the confirmed and suggested characters.
Tiki is supposed to hint at Lucina and Robin, Pseudo-Palutena at Palutena, Fi at Ghirahim and possibly Demise, and King Kihunter at Ridley.
In Fire Emblem: Awakening, Tiki is a character that knew Marth, and mistakes Lucina for Marth; she is also a character that aids Robin and Lucina throughout the story. Robin and Lucina were later confirmed.
Pseudo-Palutena is a false version of Palutena and a boss in Kid Icarus: Awakening, and was later confirmed.
Fi is the counterpart to Ghirahim, being to Link what Ghirahim essentially is to Demise: a prominent helper, helping the other in achieving their goals, be it either saving the world or dooming it. She's supposed to hint towards Ghirahim being playable.
Finally, the King Kihunter Trophy hints towards Ridley. It's the Little Birdie's (Ridley's infant form's) screech that enrages the King Kihunter and causes it to attack Samus, which consequently causes Samus to kill it. It is then seen devouring the honey left by the King Kihunter, having used Samus' power to kill it for food. This is supposed to hint towards Ridley being a playable character.
Further support for this theory comes from the music played during these quizzes. During the quiz where Tiki was shown, the music "Id~Purpose" from Fire Emblem: Awakening played, which is a theme strongly linked to Robin's character. Robin was later confirmed, alongside Lucina.
The trophy of Fi had Ballad of Goddess, which is remixed with Ghirahim's theme on the Skyloft stage, further hinting towards Ghirahim.
The trophy of Pseudo-Palutena had The Return of Palutena playing. Palutena was later confirmed.
Finally, the trophy of King Kihunter had Ridley's theme from Other M playing. This strongly hints to Ridley.
With the evidence we have and what we have been provided, this theory is looking more and more likely by the day. If it is true, Ridley is extremely likely to appear as a playable character, alongside a Zelda newcomer.
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Con0rrrr Will this do? Took me a while.