Baby Polari

Baby Polari is the young version of Polari, Rosalina's trusted advisor. He made his first appearance in Wario Kart: First From The Start! as an unlockable character. He's evil and hates Baby Rosalina, and he's always coming up with crazy plans to murder her.

The beginning
Baby Polari was born in the Big Bang, and is thus one of the eldest Lumas (despite being a baby he already has like... a gajillion years). He kickly became king of the Lumas and the cosmos (Rosalina is supposed to be this but the Lumas still haven't met her by this point).

At his 200.000.000 years he decided to visit the Mushroom Kingdom, where he met and quickly befriended Baby Toadsworth as they were pretty much alike personality-wise.

Since he was the king, he used his powers in his own benefit, for example he made the Lumas feed him Star Bits continuously for 5 hours every day. That's why he became so fat.

That annoying girl
All his problems came to be when a little girl randomly appeared on his kingdom. She said her name was Rosalina, and told all the Lumas a very obviously made up story which involved blue planets, spaceships, dreams, comets, and lots of other bull. Baby Polari didn't believe a single word, but all the other Lumas did, and they quickly slapped the king's crown on her head. When poor Baby Polari complained about it, they made him the queen's advisor.

Baby Polari swore he would not permit this and since then he has been constantly tried to kill that annoying inexpressive girl with cleverly designed traps. Unfortunately for him, the girl seems to have odd powers that he constantly uses to avoid the traps. Baby Polari has convinced Rosalina that all those traps are made by evil conspirators who are trying to kill her, and he technically isn't lying.

Due to the obvious continuity error that it would create he isn't going to kill Rosalina in his youngster days, as for his adult/elderly days... who knows?