Tattooed Man is based on classical yakuza. Mainly because of his clothing, his weapon and the famous body-covering tattoos that they use. In Japan, tattoos are engraved as the clear signs of a criminal.
"Japanese yakuza who have become demons. It is said that the larger the tattoo inked on their back by master artists, the greater the caliber of the man. Normally, they prize the yakuza code of conduct, but those who have fallen this far have no regard for it."
—Shin Megami Tensei IV profile
Tattooed Man can be found in Shinjuku. He can teach Flynn the Taunt, Fatal Sword and Heat Wave skills through his Demon Whisper.