He acts like the king of the castle in his new office.
king of the castle
idiomA person who assumes a position of greater importance, authority, or prominence than others.
Since he got the promotion, he treats his coworkers like he is the king of the castle.
The manager, long accustomed to being the king of the castle, struggled to accept the new leadership structure that limited his absolute authority.
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castle in the air
A desire, idea, or plan that is unlikely to ever be realized; a visionary project or scheme; a daydream, an idle fancy, a near impossibility.
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drama king
An overly or exaggeratedly dramatic person, especially a man or a boy.
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fit for a king
Lavish; luxurious.
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king of all one surveys
Possessing governing authority over a range of territory; having decisive control or oversight over all major matters within one's ambit of influence; having a satisfying position of respected leadership or comfortable prestige.
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king of beasts
The lion.
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king of birds
The eagle.
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king of the hill
A person who is meanwhile in leading position in an ongoing competition.
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King of the Jungle
The lion; Panthera leo.