Hair can be used for the same purpose and may be accompanied with the shadow. However, without the shadow, hair slightly covers the face but no eyes are visible behind it, where they should be. (Nodoka Miyazaki from Negima is commonly seen this way and is considered a hairstyle: On side views, only one eye is made out before the hair cover-up begins.)
Hats or other head wear can be used for the same purpose and may be accompanied with the shadow.
On rare occasuns, the eyes will be shown with the shadow, indicating a grim resolve. This is also seen in Pokemon with the team rocket grunts.
Character becomes monochrome during states of extreme stress or shock.
Character becomes a wavy paper doll and undulates, indicating shock or playful bliss.
Character shakes their arms with their hands closed in fists, and they are shown as multiple flesh-colored balls with motion lines and no arms: Indicates irritation, impatience, confusion or loss of control, or occasionally, running away from something or someone. Many times this one is shown full-body, with the same effect happening for his or her legs.
When the character hears something very interesting or shocking behind their back, their ear instantly becomes much bigger and moves. A variation of this one appears in Slam Dunk, in which lead character Hanamichi Sakuragi sometimes folds his ears closed when he does not want to hear what others are saying.
Short vertical red lines appear or flash above the character's head before disappearing, indicating that something has caught the characters attention or understanding.