Megumin[]
After being saved by Wolbach, Megumin idolized the goddess and the Explosion magic she used. The raw power emitted by her Explosion changed Megumin's life - setting her down the path of Explosion magic. While teaching the spell to Megumin, Wolbach showed concern for the former's future, believing that Megumin dedicating her life on Explosion magic would be a waste. When the two eventually parted ways, Wolbach promised that she would never forget the little girl.
Upon meeting again eight years later Wolbach claimed to not know who Megumin was, deeply saddening the latter. However, it was later hinted at that Wolbach was merely pretending to forget Megumin.
Megumin was wracked with guilt after killing Wolbach and was only able to forgive herself after being consoled by Kazuma.
Kazuma Satou[]
Upon meeting, Wolbach and Kazuma felt an inexplicable connection to one-another (most likely due to Kazuma's connection with Wolbach's other half Chomusuke). Most likely due to this connection, Wolbach and Kazuma elicited genuine interest in each others' worries during their second meeting in the mixed baths. Kazuma displayed more compassion towards Wolbach than any other Devil King General and tried to reason with her right up until her death.
Aqua[]
Wolbach maintained an intense rivalry with Aqua, the Goddess of Water. This hatred mostly stemmed from Aqua claiming that Wolbach was a false and evil goddess with no followers, while Wolbach doubting Aqua's godhood and claiming she was a minor god compared to Eris.