A hoarder.
A person who keeps bees is a Beekeeper or Apiarist.
The person who keeps calling you is someone who is trying to reach you through phone calls.
an introvert
auto part keeps track of the mileage a person has driven
The person laughs at your jokes and keeps staring at you.
An aloof person is one who keeps their distance from people.
The person who keeps your dog while you are on your holiday is called a sitter. Just like a baby sitter!
An inquirer or seeker is a word that describes a person who keeps searching for answers.
An accountant.
An apiarian is a person who keeps bees.
A florist
accountant