Good Star is a minor character in the SMG4 series.
It is a immortal star, created by SMG3 and Bowser to match the skills of the Ztar, in the blooper Super Mario 64 Bloopers: Bad Stars. Instead of being half Toad , this star was half Old Man Hobo. It never actually defeated Ztar, but after Mario knocked it out using Toad, the Ztar got tied up on a boat, with the good star "guarding" it forever.
It soon make a re-appearance in "Bad Stars Back" where Ztar frees itself and attacks Good Star. Good Star later is mentioned to take a bath and will take at least 20 minutes to take on Ztar again. Despite this, it quickly comes to the rescue in at least a minute disguising as a normal star. It's last seen defeating Ztar and sacrifice itself by sucking Ztar into a portal with itself.
- Unlike it's evil double, the Good Star doesn't have eyes, as the Ztar has eyes and occasionally has Toad faces instead.