King Grambi (called "Grams" by Queen Jaydes) is the grumpy (yet supporting) father of Luvbi, husband of Queen Jaydes, and king of the Overthere. When Mario escorts Luvbi to the Overthere from the Underwhere, the Overthere is found under siege by Skellobits, with a majority of the Nimbis (the inhabitants of the Overthere) and Grambi being trapped in ice. Grambi was confronted by Bonechill when Mario and co. arrived at his shrine.
After the player completes the game and returns everything back to its normalcy the player can go back to the Overthere. When they do this, the four heroes can go back to King Grambi's temple and can find him standing there with Queen Jaydes and Luvbi. It is unknown how Luvbi returned; it is believed that it happened when everything was returned to normal.