Muttler
Muttler (JP: ワンコー Wankō) is a deceased Lightner in Deltarune.
Muttler is never seen alive in game. Their tombstone is marked with a bone.
Not much is known about Muttler's personality, but they are described as "leader of the pack" on their gravestone, indicating they were presumably held in high regard and with respect among the Wet-Nose Bandits.
Muttler's gravestone is situated in Hometown's graveyard, placed between the gravestones of Shyra and Crystal. Kris can visit the gravestone at any point that they are allowed to explore Hometown.
In Undertale, Endogeny is one of the Amalgamates encountered in the True Lab. It is composed of the determination-filled SOULs of several dog monsters, including the family members of Dogamy, Dogaressa, Doggo, Greater Dog, and Lesser Dog.
Muttler may correspond with one of the many components of Endogeny.