In Super Smash Bros. for Nintendo 3DS, Ghosts appear as enemies in Smash Run. They hold shields that can block hits and reflect projectiles. Ghosts follow the player's fighter, hovering in front of them. They can be only attacked by hitting their top, bottom, and behind, and they can be grabbed and thrown. The game has a trophy of a ghost, and it also shows a blue ghost and a blood ghost.
Super Smash Bros. for Nintendo 3DS trophy information
Ghosts that appear in the Find Mii game in StreetPass Mii Plaza. In Smash Bros., these ghosts have their own shields to ward off attacks. They try to keep their distance, but that doesn't mean you can ignore them— they'll often use their shields to protect other enemies. Hit from behind to defeat these pests. These ghosts have come over from the StreetPass Mii plaza game Streetpass Quest, armed with shields. They don't attack and prefer to keep their distance, so they're not much trouble...until they start defending other enemies from you. Their shields block attacks and reflect projectiles. So you'll need to attack from behind or throw them.