Dean Ambrose goes to...
...it depends!
As a character, Dean Ambrose is one of the most fascinating in WWE. Seth Rollins' betrayal of the SHIELD unveiled a new side of Ambrose - a side that fans would refuse to boo especially since it was he who pursued the betrayal with true heartbreak, unlike partner Roman Reigns (possibly the reason why fans didn't latch onto Reigns as a mega babyface for).
Of course, since the WWE didn't see much in Dean, they turned his bitter and popular face character into a comedy act. His lunacy was turned into the hilarious antics of a laid back rebel, that while initially cheered the fans up has since become nauseating. No wonder, it's a boon than that he has been injured and can come back rejuvenated, and hopefully this time as a heel.
To anyone who has seen Dean's work in the hardcore indie promotion CZW or even his initial efforts in the SHIELD can attest to the fact that he'd make a fascinating psychopathic heel.
As such either version of Ambrose is a perfect fit for NJPW, depending on the faction he decides to join.
If he enters New Japan with his laid-back prankster persona, then he'd be a perfect fit for the anarchic and often disrespectful but beloved Los Ingobernables de Japon. If the original Mexican faction were to make their way to the WWE, Dean Ambrose would be the perfect leader.
As part of the New Japan version, he'd play off well against Tetsuya Naito and his boys as the first gaijin star to join them. Communication problems amongst them could be played off as comedy, just imagine when Mitch the plant meets Daryl Takahashi?
Yet when it comes to the ring, despite their disrespectful demeanour and unorthodox mind games, LiJ and Dean Ambrose can absolutely take the fight to anyone. It's a perfect fit.
But if Ambrose does decide to revert to his original psychotic heel persona, then there's only one place that would be willing to accept him - Suzuki Gun!
Dean's former persona, Jon Moxley, shares a lot in common with faction leader Minoru Suzuki, with their penchant for brutality, and winning by any means necessary. He'd be the perfect bit of madness that would possibly push Suzuki Gun to new heights in New Japan.