#8 Kushida

If you're not a huge NJPW fan, you may be unfamiliar with Yujiro Kushida - but he's a huge name and will make major waves when he debuts in WWE.
Kushida is a six-time IWGP Junior Heavyweight Champion and a two-time IWGP Junior Heavyweight Tag Team Champion, as well as the winner of the 2015 and 2017 Best of the Super Juniors tournaments, the 2016 Super J-Cup and the 2017 Pro Wrestling World Cup. In ROH, Kushida also held the ROH World Television Championship.
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Outside of the ring, though, Kushida is also a former professional MMA fighter and ended his career with an undefeated record.
#7 Ilja Dragunov

Dragunov would be another huge name and was allegedly backstage at NXT TakeOver UK where his former wXw rival Walter debuted.
Dragunov attended WWE's European tryout late last year and has recently been pulled from a Pro Wrestling Chaos show due to "other commitments" on the weekend of TakeOver in Blackpool, as well as being removed from the card for an upcoming Defiant Wrestling.
One of Dragunov's trainers was Alexander Wolfe of SAnitY.
#6 Jonah Rock

Jonah Rock is a 30-year-old Australian wrestler most famous for his work in Pro Wrestling NOAH. Rock is a former AWA Heavyweight Champion and PPW Pacific Heavyweight Championship and has held singles and tag team titles across several other promotions in Australia.