Facial Expression Vocabulary in Manga

Manga uses a stable inventory of stock symbols on or around the face to communicate emotional state. These symbols — sweat drops, throbbing veins, swirling eyes, the catbow mouth — operate as a visual shorthand the reader learns implicitly. This page collects the most-frequent conventions.

Symbols on or near the face

Sweat drop (汗, ase) — a single oversized droplet on the side of the head indicates embarrassment, exasperation, or strained tolerance. Multiple sweat drops escalate the intensity.
Vein mark (青筋, aosuji, lit. 'blue tendon') — a four-leaf throbbing symbol on the forehead or temple indicating anger held in check.
Nosebleed (鼻血) — a small dribble from the nose at the sight of something arousing or shocking; a long-standing comedic shorthand.
Pillar of shadow (gloom-aura) — vertical hatching falling across the upper half of the face indicates depression or despair.
Flame aura — visible flames or aura around the body indicate fighting spirit or rage.
Ahoge (アホ毛, lit. 'idiot hair') — a single piece of hair sticking up from the top of the head, sometimes acting as a mood indicator (drooping when sad, animated when excited).

Eye conventions for emotion

Swirly eyes (ぐるぐる目) — concentric spirals replacing pupils indicate dizziness, confusion, or unconsciousness.
Star eyes — pupils replaced by stars indicate excitement or infatuation.
Heart eyes — pupils replaced by hearts indicate love or attraction.
X eyes — pupils replaced by X marks indicate the character is knocked out, dead, or in extreme pain.
Dot eyes — pupils reduced to small dots with the whole eye visible indicate shock, fear, or madness.

Mouth conventions

Cat mouth / catbow (にゃんこ口) — the mouth drawn as a wide letter '3' on its side, conveying playfulness or cuteness.
Wavy mouth — an exaggerated wavy line indicating distaste, near-tears, or disgust.
Square mouth — an open square mouth indicates loud shouting or screaming.
Closed-line mouth — a single straight horizontal line indicates serious mood, irritation, or determination.

Whole-face transformations

Chibi / super-deformed — the character briefly switches into an exaggerated small-bodied caricature for a comic beat, then returns to standard proportion the next panel.
Reaction face (リアクション) — a stock comedic face deformation used at moments of shock; specific genres have specific reaction-face conventions.
Bishōnen close-up — close-ups in shōjo manga of male characters often switch to a more detailed, less stylised rendering than the surrounding panels, sometimes with elaborate background patterns.