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"She has a great 'Trump radar' [in] understanding how he thinks. ... She loves him like a father in some ways and I think that is an important loyalty to the family," Parscale told Newsweek in a interview published Thursday.
"I think she truly believes in Mr. Trump and his mission and his agenda, and I think she loves the [Trump] family," Parscale continued. "Being family and being treated like family allows you to deal with a lot more things you wouldn't do for just a job or money."
Hicks, 29, was named the youngest ever White House communications director in September, a role she had filled on an interim basis after Anthony Scaramucci's abrupt departure from the Trump administration in July.
Previously a public relations assistant to first daughter Ivanka Trump, she was poached by President Trump to become his campaign's press secretary in 2015.
"You keep delivering, you keep getting the job done, [and] you don't ask for anything in return," Parscale said, adding that Hicks "was always a stable force."
"Eventually you gain a relationship with him, and a friendship, and then it starts to become reciprocal," he said. "And Trump is very rewarding to those who continue to be loyal and continue to deliver results."
Hicks' relationship with the Trumps, however, has also resulted in attention from special counsel Robert Mueller's Russia probe into the Kremlin's meddling in the 2016 election.
She was expected to be interviewed by federal investigators after the president's return from Asia.
Comment: See: Mueller probe to interview White House comms director Hope Hicks in coming weeks - signals investigation nearing its end. Basically, Hicks has been around Trump for all the important events of the past months. If there were any truth to the Russiagate allegations, her testimony would support it. But given that it's all horse hockey, Hicks probably has the opportunity to clear the air and put several claims to rest. With any luck, the monumental waste of time and money otherwise known as the Russiagate investigation will die a quick death soon after.