Kobzo
Kobzo is the ambitious brother of Arfia-hin. He emerged spontaneously much like Arfia did, but much later, only about a couple years before Gaster's vanishing. Afterwards, he became very motivated by wanting to have friends, albeit with a rather naive conception of sociality. This ultimately pivoted into a desire to join Yarzon-Ebott's Royal Guard. Kobzo asked Londin Odai to join. Londin recognized that Kobzo was powerful, but deemed his overly optimistic, trusting worldview unfit for a Royal Guardsman - so instead of just turning him down, she began to bond with him in other ways, for example by giving him cooking lessons. Londin promised Kobzo a position in the Royal Guard if he could capture a human. But ultimately, in 251 X, the Royal Guard was disbanded, however Kobzo made a friend in Ana-hin.