Initial thoughts on the Trophies:
Tiki: "Yay! Tiki's making an appearance!" (Fire Emblem for the win!)
Fi: "No mistaking her, that's Fi."
Pseudo-Palutena: "Oh, it's Lady Paluten- wait, she's not playabl-WHAAAA...?!"
King Kihunter: "Okay, that's familiar... Umm, but why is Ridley's theme... Oh, the King Kihunter. I remember that one."
I must admit, seeing the Rumours page on SmashWiki, I thought, "This looks interesting..." I was particularly fond of wanting Palutena and Chrom in Smash, Ghirahim and Ridley were a little bit far fetched for me.



E3: We get Palutena, Pac-Man and Mii Fighters and this theory starts to become more credible, and so was the then mostly accurate Gematsu Leak.



14th/15th of July (15th of July if in the Australian EST time zone - Midnight, and just before the start of school... -.-) : Robin is confirmed with Lucina, and Chrom got the Falcon Punch. Now I think this is more believable than the Gematsu Leak.
And seeing the Ridley Support Thread's second post, the Trophy Theory made a bit more sense to me, and so did Tiki - She has more in common with Robin and Lucina in Awakening than with Chrom, and id - Purpose makes even more sense, it's Robin's theme. Seeing that, I thought "We should have seen the signs earlier."
With that out of the way, to me, I think it's Ghirahim and Ridley. The argument for Ghirahim on the Ridley Thread makes sense in Fi's case, an opposite to the protagonist's sidekick. In actual fact, I'm in favour of Ghirahim more than Impa. (To me, the best Impa design was the Oracle of Ages and Seasons Impa, she looks like a perfect nanny for Zelda in that game! ...My opinion, by the way. I didn't really care much about Impa in Skyward Sword, and I don't think Hyrule Warriors would actually help her. I think she'd be at least a Sheik clone, which would be underwhelming since Sheik is now finally her own character.)
Ridley's connection to the King Kihunter actually caught me by surprise after reading the Second Post. It makes a bit more sense now, and it justifies why Ridley's theme was playing. It'd be interesting if the Trophy Quiz actually contradicts what was said about the 'Boss Character's appear on other stages' statement if Ridley got confirmed. Regardless, I think it's accurate so far - The New Gematsu leak. *Cue Ghirahim and Ridley getting dropped for Pichu

and it no longer damages itself*
These are just my opinions, so please understand.