Glowing Rabbit

Glowing Rabbits are a type of Rabbit that can appear after 15 stars are collected in Super Mario 64 DS. They are white rabbits with a sparkle effect on them that can replace other Rabbits. 8 Glowing Rabbits must be collected to unlock the 5th door in the character select room and obtain a star.

Ninth Glowing Rabbit
There are rumors that there is a ninth Glowing Rabbit hidden in the game. It is not agreed upon what the ninth Glowing Rabbit unlocks, though some say it is the Big Star Key, Waluigi, the Purple Rabbit, or even the Black Box. Some also state the ninth Glowing Rabbit is the Rabbit King. Some also state that the ninth Glowing Rabbit is inside of the Black Box.

Rabbit King
The Rabbit King is a rumored rabbit mentioned in the Purple Prizes magazine, and is rumored to be a Glowing Rabbit. However, some people do not agree with this rumor, and state it is one of the other 4 rabbit colors, and possibly even the Purple Rabbit.