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Ghosts
Boo

Ah, the ever so famous Boo. The most popular of the ghosts. They first appered in SMB3. They have a starring role in Luigi's Mansion as the ghosts who caused everything. They are my 2nd favourite enemies.
Boo Diddly

Um....this is Boo Diddly.....he um, first appered in... uh.....OK I'll level with you, I know nothing about this guy! I heard about him everywhere, so i had to put him up!
Eerie

He first appered in SMW. They attack in groups, so they can be hard to avoid.
Grim Reaper

A ghost type Shy Guy. He does have similarities to the Grim Reaper doesn't he? He looks like he's from SMW2.
Phanto

Although not transparent, Phanto is concidered a ghost type. They are only found in Sub-Con, in vases and castles. When you pick up a key, they will try to take it back by damaging you. I guess you could call them "The Keepers of the Keys" HAHAHAHA(Harry Potter rip off) *ahem* They cannot be killed so don't even try.
Stretch

These annoying guys are only found in SMB3 castles. If I'm correct, you can't kill them with anything. Maybe a star but I'm not 100% sure. They're a white bar with Boos that pop out, while trying to catch you.