well he has them because they have many uses: controling, weapons, and they hold or do something with chakra or something like that..... weather or not ppl think he is ugly is their own opinion and i don't really care..... its Masashi Kishimoto's desigin so i like it <3
i'm not that sure but i think it's so Nagato can control him and other uses like:nwepons,chakra,the paths of pain or something like that.but if u think he looks ugly well that's what u think i think he pretty cool myself,some people amor piercings some people hate them some people just like them.u may think he looks ugly but i think he's pretty cute myself.(but not as cute and hot as Deidara-Sempai and Sasori-Dana and Hidan(yes i think Hidan's cute/hot u got a problem with that))