yes, for water base paints and stains only
2
There was no Shadow Kirby in Kirby 64. The Shadow Kirby appearances are: Kirby and The Amazing Mirror: Shadow Kirby was an enemy. Kirby Squeak Squad: Kirby could spray-paint himself to look like Shadow Kirby.
No.
oil on canvas
Couldn't find it.
go to a steam cleaners
Ammonia absolutely DOES attack paint! Do not use glass cleaner on paint! Use a product meant for painted surfaces.
Vacuum
Mineral spirits or turpentine (oid). Use the first. You can get an odorless product. This suggestion is for your brushes.
Remove the paint at the point of attachment.
Cut out the piece of carpet it's on, of course! But if that isn't financially possible, ask your local carpet cleaners/dry cleaners(?) about spot removal.
Depends on what the original format is. Generally, you can download the attachment, open it in a program such as Photoshop, MS Paint, etc., go to "Save As", and save it as a JPEG.