Elwood P. Dowd is one of the few people who can see Harvey, the giant rabbit.
Fred Flintstone & Barney Rubble are among th only people who can see the Great Gazoo.
For a long time, Big Bird was the only one who could see Mr. Snuffleupagus.
What other characters are there that hardly anybody else can see?
Cosmo Topper is the only one who can see George and Marion Kerby (or Neil).
Only Lydia can see Adam and Barbara most of the time in Beetle Juice.
Well, pretty much all of the mythical creatures in The Spiderwick Chronicles only let themselves be seen by people with “the sight” (or, at least, this was the case in the movie…I haven’t read the books).
Along the same lines, thestrals.
The alien entity that pretended to be Captain Janeway’s father in an epsode of Voyager could only be seen by her.
Also from Voyager, the Evil Clown that could only be seen by the people in the mental link that generated it.
One of the Sixes on BSG appears to be in Baltar’s head.
Would the aliens in They Live count? They can be seen by anyone, but can only be seen in their true form (at least for the majority of the movie) by the few people who have special glasses.
Only Roy Greenhilt sees his father Eugene’s ghost in The Order of the Stick.
Only Chris Griffin sees the Evil Monkey on a regular basis on Family Guy.
Only Sparky Valentine can see Elwood in The Golden Globe.
only Calvin can see Hobbes as he really is.
The Ringwraiths, in The Lord of the Rings, in a sense. Although anyone can see their earthly garments, their faces are invisible to anyone who cannot see into the wraith world.
Al from Quantum Leap can usually only be seen by Sam.
Constable Benton Fraser on Due South is normally the only character who can see the ghost of his murdered father, Sergeant Bob Fraser, who tries to give him advice in different situations, of varying degrees of usefulness. Also, Detective Vecchio somewhat more rarely sees his own dad, who almost always is trying to get his son to ditch Fraser and “look out for Number One”, usually when Fraser is in some great deal of trouble.
Not sure if they count, but the ghosts that visit Scrooge are only seen by him. Whether they can or could only be seen by him is a point to ponder.
The whole premise of the TV series ‘Randall & Hopkirk: Deceased’ was that only Randall could see the ghost of his former partner, Hopkirk.
Ghosts in Sixth Sense and any number of other ghost films come to that
Nobody can see Frank except for Donnie Darko.
The “Only you can see and hear me” cliche was a common one.
The most execrable example was Eric Idle in the absolutely dismal comedy “Nearly Departed.”
I think both versions of The Ghost and Mrs. Muir used the cliche.
Hearts and Souls also uses it, where Robert Downey, Jr. is the only one who sees the ghosts.
This series was shown in the US as My Partner, The Ghost
In the book & movie of Thomas Tryon’s The Other only Niles could see his dead twin brother Holland.
In Stephen King’s The Girl Who Loved Tom Gordon, Trish McFarlane sees a lot of things that may or may not be there.
In the LotR film, Smeagol could see Gollum (and vice versa).
By the same token, Capra #6 sees Baltar in her head.
In **Just Like Heaven ** (I know, I know - my daughter was watching it. Honest!) only Mark Ruffalo’s character can see Resse Witherspoon who is sort of a ghost (her character is in a coma).