It's the color of his inner hollow's eyes.
no they are not they are just naturaly born with it.
Often when a guinea pig has a respiratory issue (which are serious ) yellow crusties will form at the eyes and nose.
Shinji has mastered his hollow form so he really doesn't have a limit
2
Do not fear, you are not a werewolf nor a were-animal. You have some form of hepatitis and should seek medical aid quickly.
fullerene
The plural form is eyes; the singular form is eye.
No, Ichigo's zanpakuto does not change in his hollow form. If you watch the "Zanpakuto Rebellion" arc, you can see this when Ichigo is fighting against the materialised form of Zangetsu, his zanpakuto. Ichigo cannot call on Zangetsu's power, and so he cannot use Bankai. Instead, he releases his hollow form, which is a raw power inside Ichigo. So Ichigo's zanpakuto remains completely unchanged while in hollow form.
Ichigo's bankai is called Tensa Zangetsu, meaning Heaven Chain Cutting Moon. It is an all black zanpakutpou, with a black chain on the end. He eventually realizes his bankai won't work against the espada, so he gains the power of a hollow by hollowfying. HAVE YOU NOTICED THAT YOU NEVER SEE TENSA ZANGETSU HUMAN FORM WELL... LATER IN THE MANGA ICHIGO IS LOOKIN FOR AIZEN AND SOME STRANGE KID SHOWSUP. SOONER OR LATER HE REVEALS HIMSELF AS TENSA ZANGETSU! BUT HE DOESNT WANT TO HELP ICHIGO LEARN THE FINAL GETSUGA TENSHOU SO HE BRINGS OUT THE HOLLOW IN ICHIGO. THEN HE FUSES WITH THE HOLLOW AND ICHIGO HAS TO FIGHT THEM!
Eyes'
Kettles
from king mickey in hollow bastion