Thron

Thron is a character that you can't see. He's there in every episode, but he's 99% transparent.

Sadly, he died because Buu was in a blind rage, shooting random ki blasts, and one hit him. Since Buu is so powerful, he died in an instant.

Buu could most likely Destroy the Multiverse as it is shown in Buu Season II that 5% Buu is almost as strong and 10% Grand Priest.