A person who never loses their temper can be described as calm, composed, or even equanimous. Such individuals often exhibit emotional stability and self-control, allowing them to handle stressful situations without becoming angry. They may also be referred to as patient or level-headed, demonstrating a remarkable ability to remain serene in the face of challenges.
A person with a bad temper is called "enojon"I agree but also.....A person with bad temper is also called temper active.
A meltdown!
A Narcissist.
Congress
a pacifist
Poker-faced.
I guess you can call that person an athlete.
A person who repairs pipes would be a plumber. I have never heard of any person who specifically repairs tape.
A lifelong learner or autodidact.
a dead one
Hypocritical or all talk.
Argumentative, difficult, problematic, disagreeable.