Balto Phthalo (バルト・フィサロ) is a supporting character in So I'm a Spider, So What?, voiced in Japanese by Yuuichirou Umehara. The series' music includes "So I'm a Spider, So What? - Opening Full「Keep weaving your spider way」by Riko Azuna", "So I'm a Spider, So What? - Ending | Do Your Best! Kumoko-san's Theme".
