1. When you become vindictive or angry, your teeth spontaneously become sharp.
2. During periods of overwhelming emotional arousal, your pupils and irises are overtaken by raging sclera.
3. You have projectile tears.
4. When you sleep, a giant booger bubble emerges from one nostril, serving as a visual indicator of your breathing patterns.
5. When stressed, nervous, or humiliated, you clench your fists about your skirt. If a skirt is unavailable, you ball up your fists regardless. A skirt helps though.
6. From a frontal view, your eyes appear to comprise approximately 50% of your facial area.
7. Your hair is incorrigibly sharp, possibly even useful for making shish kebabs.
8. You have a highly diminished or nonexistent nose.
9. Substantial emotional arousal produces unusual facial discoloration. Sometimes, the color may appear to “fill your face up”, as if filling a teacup.
10. Your mouth is capable of exceeding the bounds of your face.
11. Your hair is naturally an absurd color. Simply absurd. Like lavender.
12. Your life has no meaning unless you are between the ages of 10 and 17.
13. Your reactions to mundane situations are pronouncedly extreme. Untied shoelace? RIP OFF YOUR EYEBROWS AND CALL THE POLICE.
14. Your palm pilot enables you to transform into a superpowered alter ego with a themed outfit.
15. Your legs are about twice as long as the rest of your body.
16. Your legs are about half as long as the rest of your body.
17. You can eat volumes of food exceeding the volume of your body. Obviously your digestive system makes use of Link’s item bag or some such.
18. You are persistently cross-eyed.
19. You wear innumerable bells and whistles. Literally.
20. On the whole, your American voice actor is terrible.
21. When embarrassed or in a tense situation, you can conjure a large tear about your head.
22. Your high school drama causes stars, hearts, or other clichéd images to pop into existence.
23. All of your friends have some martial arts specialty.
24. Upon having an epiphany, you strike a pose.
25. Your cat is a tiny little black fellow who spends his time perched on your shoulder, eyes constantly wide. If he meows, it is a ridiculous sound that no one would ever impute to a cat. It sounds more like a tea kettle wheezing.
26. You constantly verbalize your inconsequential and obvious thoughts.
27. You talk to yourself in front of EVERYONE. Doesn’t matter who it is. You’re going to talk to yourself in front of them. And you’re going to say something stupid.
28. You are furry, striped, have cat ears, and/or a tail. Possibly even paws.
29. You will go to ludicrous lengths to have sex, including riding a bicycle on a telephone wire.
30. Your hair covers your eyes, and yet, you see.
31. There are demons at your school. Yeah, it’s pretty cool. Sometimes you fight them. You know, if you can flip your hair out of your eyes. It’s pretty cool. You’re such a cool guy. But whatever.
32. Your sword is nonsensically large.
33. There are things like ^^this^^ where you come from.
In conclusion, the world of anime is a thermodynamically preposterous place, and it would be most frightening to ever visit it. Thankfully, we can just watch it instead. And, naturally, consider this a cordial invitation to post more signs you may be an anime character in the comments section. O.O