Dante fan? Itsuno said DMC needs to come to Switch before Dante could be considered for Smash, and a port of the first game was announced a week later. A DMC reveal is confirmed for the same date as Sakurai's presentation.
Ryu Hayabusa fan? Koei Tecmo is a major company that's developed many games for Nintendo in the last few years, and with Atlus and SNK being brought on board with the Fighters Pass it makes sense to include Koei Tecmo.
KOS-MOS/Heihachi/Lloyd/Dark Souls fan? All of the Namco Mii costumes are suspiciously absent, paving the way for a Namco-focused wave 5.
Arle fan? Puyo Puyo's director retweeted Sakurai.
Doom Slayer fan? The Mii costume leak technically hasn't been disproven yet, and Doom Eternal releases in a couple of months.
And so on and so forth.
No character has a stronger case than another, and remember that if your preferred character is revealed on Thursday that you weren't privy to some special insight that the rest of us were too stubborn to grasp. We're all in the dark right now.