Light himself is 100% human and so can be easily killed if he is unable to react against his assailants: especially if he doesn't know the name of his enemy.
The Death Note can still be burned or destroyed.
If Light loses possession of the Death Note for 490 days.
If this misspelling is done 4 times intentionally the owner of the Death Note will die.
(this victim will be freed from the Death Note as a result, unless the misspelling was intentional)
If a victim's name is misspelled four times.
The entire Death Note will be rendered useless under certain circumstances.
The Death Note cannot kill someone at the time after they died from a different form of death. The Death Note will not kill someone already 12 minutes away from death.
The Death Note will not affect those under 780 days old or over 124 years old.
If Light attempted to kill L, but accidentally killed Hideki, then L would know that Light is Kira. Light was initially unable to kill L because L used a fake alias: sharing his name with pop-star Hideki Ryuga. This is so the Death Note does not kill multiple people with the same name.
Light/Kira needs to know both the name of his target and who the target looks like.
It is unable to kill any being that is not a human ("The human whose name is written in this notebook shall die").
The Death Note has many restrictions on who it can kill.
The Death Note cannot kill someone if their name is misspelled.
Scored a perfect score on his college placement exam.
Was able to escape capture after being shot in his hand.
Seduced almost every woman he encountered.
Out maneuvered L, Mello, and Near before being caught.
Killed thousands of criminals undetected for 7 years.
Anyone who owns a Death Note is immune to Shinigamis except for the Shinigami that gave that human that Death Note.
Can give up memory of the notebook and killings by forfeiting ownership back to Ryuk.
Any mortal human killed by the Death Note cannot be revived under any condition.
Light carries a small piece in a wrist watch so he can kill without being seen.
Scraps of Death Note work as well as the book itself.
The book will create an infinite amount of pages to guarantee that it will never run out.
Can kill multiple people simultaneous from the same event that killed them so long as it is physically possible.
Can manipulate peoples actions before death brainwashing them to commit suicide.
Cause and time of death must be within reason.
Light can determine the details and time of the death.
The death will occur automatically within 40 seconds as a heart attack (or if the details of the death are explained, it will take 6 minutes and 40 seconds unless the time of death is listed).
The book is magically imbued by the Shinigami (Gods of Death) to kills any human who's name is written in it.
Light has owned 3 different Death Notes.
(Humans however do not receive this benefit)
Used by these demons to feed on human lifespands to extend their own lives.
(Ties with Near, though both are still second to L according to Ohba)
Rohan Kishibe ( Jojo's Bizarre Adventure).
Mandy ( The Grim Adventures of Billy & Mandy).
Burger Beard ( The SpongeBob Movie: Sponge Out of Water).