Description:
These bubble blowers were White Castle premiums in 1992, I think. The characters are Woozy Wizard, Princess Wilhelmina, Wendell (in green), and Sir Wincelot.

As is true of many self-contained bubble blowers, the heads unscrew and have attached bubble wands. The bodies hold the bubble solution.

Some ebay sale prices -
... 1998, one set of four sold for $18.75.
... March 2003, 3 of the characters sold for $4.
... Feb. 2006, Wendell sold for $5.