I have started to verify all characters in two versions (Traditional and Simplified) of Chinese and Japanese, after reader Eden Li's suggestion. Chinese (Hanzi) and Japanese (Kanji) share some characters, except meanings and writings may vary.
Tattoo above still means "power pig" in both Chinese and Japanese.
力 = power, force
豚 = piglet
sources:
AltaVista
JDIC
Wikipedia (Chinese & Japanese)
Worldlingo
Zhongwen
Unihan