I don't know much about Japanies wrestling.

DAMN................................................

This is so freaking unfair.....

Kenta Kobashi
Antonio Inoki
Keiji Mutoh (or the Great Muta)
Jushin Thunder Liger
Tatsumi "The Dragon" Fujinami

idk

#1 The Great Muta Keiji Muto
An absolute phenom who continued to evolve and add new moves into his deadly arsenal right up to his retirement. A multi-time IWGP Champion who also had great sucess wrestling in America.The best Japanese wrestler I have ever seen.
#2 Jushin Thunder Liger
The BEST Cruiserweight on the PLANET. A 9 time IWGP Light Heavyweight Champion. You name the roster of the World's best cruiserweights...Liger has Defeated them all. Not to mention the absolute coolest mask of all time.
#3 Antonio Inoki
The Father of Puroresu (Japanese Wrestling) Inoki is a LEGEND in Japan. He has defeated both Ric Flair and Hulk Hogan in IWGP Title bouts.
#4 Mitsuhara Misawa
This guy is AMAZING. Besides Muta the best Heavier Weight Japan has to offer.
#5 Kensuke Sasaki
Anybody who can hold their own against Sting as many times as he has is gonna EARN my respect.And this guy is a MONSTER for a Puroresu Wrestler..Huge.
There you go.....my 2 cents

Antonio Inoki
Kenta Kobashi
Akihisa Mera "the great Kabuki"
Keiji Mutoh "the Great Muta"
Yasuhiro Kojima "Hiro Matsuda"

that is tuff to narrow down to just 5

the top 5 has been given in other answers so I'll list my five of my favorites 5 Kensuke Sasaki 4 Masahiro Chono 3 Nobuhiko Takada 2 Masato Tanaka 1 Hiroshi Hase