The main thing for Japanese pig emoticons is the snout which you can make with two 0s, Os, os or a ∞. You can do pretty much anything else you want for the rest of the face.

 

。゚(゚´(00)`゚)゚。(;゚(OO)゚)(*´(00)`)’
( ̄(∞) ̄)( ̄(▽▽) ̄)(=`(∞)´=)
ヽ(*’(OO)’)ノ゚q( ̄(oo) ̄)p( ´(00)`)
(*’(OO)’*)(`(●●) ´)( ̄(oo) ̄)ノ
(○`(●●)´○)ノヾ(;゚(OO)゚)ノヾ(@^(∞)^@)ノ
ヽ(*’(OO)’)ノ૮⍝◜•⚇•◝⍝ა(͒⚈ै⚇༵⚈ै)͒
(;´∞`)