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.
An accountant.
An apiarian is a person who keeps bees.
A florist
accountant
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.