Pennington

A penguin detective whom calls Mario his brother Luigi in Paper Mario:The Thousand Year Door.

Appearances
In Paper Mario:The Thousand Year Door Year Door is the only place to see him.He is on the level Three Days of Excess where he claims he is the worlds greatest detective when it's just his hobby.

Why he's important
Pennington just so happens to be a holder of the Garnet Crystal Star when Beldam,Marilynn & Doopliss steal the fake crystal star & Mario goes after it.

Where to find him
If you just got of the train go through an open gate till you see a huge mansion & go in it,it's called the Poshley Sanctum.

His job
If you've played,Pennington probably said he's the mayor & he runs the sanctum.

Why you can't see him again
You won't be able to see him again because he says he has to leave to go investigate again,so he leaves & Mario just got a new star.