Numbers Magazine run a fan poll to find the most popular wrestlers amongst Japanese fans every year, they just published this years:
New Japan guys on there:
1. Tanahashi
2. Naito
3. Okada
4. SANADA
5. Ibushi
6. Hiromu
12. Shingo Takagi
17. Jushin Thunder Liger
18. Ishii
19. Minoru Suzuki
20. Taichi
22. Will Ospreay
23. EVIL
27. Taguchi
28. Jay White
30. Shibata
38. BUSHI
44. Goto
52. El Desperado
55. Zack Sabre Jr
66. Togi Makabe
71. Toru Yano
76. YOSHI-HASHI
82. Satoshi Kojima
89. SHO
96. KENTA
97. YOH
Naito had been the most popular for the past two years but looks like there has been a resurgence in Tananhashi, Naito still massively popular though. Just look at that gap between him and Okada. Oof. Also, no Moxley but there's a chance he wasn't in New Japan at the time this poll was taken (so KENTA going off his WWE run too probably). On the other hand, no sign of Jericho either. Also worth noting that Nakamura, Kenny Omega and AJ Styles are all still popular in Japan.