because day have a dark heart
yes
A possible word would be "villain".
that is a protagonist
he got shot
The word 'villain' is a noun; a word for someone who is wicked or evil; a word for a character in a story; a word for a person.
a person that hacks in to people acounts
An alarmist is a person who causes others to become alarmed without due cause.
become a villain seems more fun i really don't want to die
villain
Yes, it is possible for one villain to kill off another villain, especially if they have conflicting goals or interests. This scenario of one villain eliminating competition or perceived threats is a common trope in many stories and can add tension and complexity to the plot.
feeling keyed up
Feeling Keyed Up