The word sycophant would be what you are looking for. It is described as "a servile self-seeker who attempts to win favor by flattering influential people".
Other words that could be used include slang such as: butt-kisser, crawler, toady, lackey, slave, parasite, cringer, fawner, hanger-on, sponger, brown-noser, bootlicker, flatterer, truckler, lickspittle, apple polisher, and toadeater.
Renunciation of Personal Gain & service to others
One's own personal gain is known as self-interest.
The term is spelled "con artist", and it refers to a deceptive person who takes advantage of others for personal gain.
Personal gain means where there is no public interest and it's solely yours.
As long as there has been religion, people have used it to manipulate others.
Bandits do as they please and make little or no effort to get along with others in their society. They generally are known for breaking laws for personal gain.
It is often said that certain persons will sell their souls to Satan to get personal wealth. It is a grievous sin to get gain at the expense of others. Though Satan cannot make you do his bidding he can put the temptation in your mind.
Ethical persuasion involves using honest, respectful, and fair tactics to influence others' beliefs, attitudes, or behaviors. It focuses on transparency, integrity, and understanding the other person's perspective, ensuring the persuasive process is conducted ethically and without coercion.
A cruel character may enjoy inflicting pain or suffering on others, show disregard for the well-being of others, manipulate or exploit others for personal gain, and lack empathy or compassion towards those around them.
An exploiter would be one who uses advantages and/or people for personal gain
People may scheme for various reasons, such as gaining power, seeking revenge, or manipulating others for personal gain. It may be driven by a desire for control, insecurity, or a lack of empathy towards others. Scheming behavior often stems from a combination of personal motivations and situational factors.
Depends there are white and black hat hackers. White hat basically hack to to exploit problems and fix them. Black hat hackers hack for personal gain.