Probably WALTER, since he went from an outsider indy guy to top guy in the biggest company on earth, I would assume.
For similiar reasons: Eddie Kingston, Hechicero, Samoa Joe, CM Punk, Kana/Asuka, Zack Sabre Jr, Sami Zayn, Kevin Owens, Darby Allin, Bryan Danielson (though his stock was already quite high the last time around).
Darlings outside the biggest feds that I would guess have garnered quite a bit of hype: Sareee, Takumi Iroha, Chihiro Hashimoto, Fuminoru Abe, Takuya Nomura
In my personal estimation: Yasushi Sato, Blue Panther, Keita Yano, GENTARO, Hiroshi Watanabe (just based on the work they've done in the past 10 years)