Masako Hara is a TV medium with a gift for seeing and channeling spirits, although it is questionable whether her powers come from possession or psychometry. Although she is only 16 when the series begins, she has a thoughtful, mature personality, possibly due to the fact that she can sense and feel spirits everywhere she goes. She has shown tremendous compassion and empathy for the spirits she senses. Throughout the series, she had developed a crush on Naru.

Masako is a very calm, composed individual who does not often show her feelings. This composure is shown in Volume 2 to be partly because of shyness; Masako is mortified at the suggestion that she might have kissed Naru, despite her crush on him. During the Bloodstained Labyrinth case, Masako begins to open up to Mai about her feelings. She is jealous that Naru calls Mai by her first name, and is worried that they might have a secret relationship. When Mai reassures her that this is false, Masako relaxes and starts to act more friendly towards Mai--although, at the time, she tells Mai that she hates her. In later cases, Mai and Masako joke together a little bit; Masako teases Mai for being "hot-blooded," and giggles when Mai misinterprets her and, in fact, hot-bloodedly defends herself.

Masako is a very capable medium. However, out of all the SPR characters, her powers are perhaps the hardest to pin down. She can see the spirits and sense their shape, but sometimes the spirits fool her, or what she sees doesn't make sense in the context of the investigation. For instance, in the "After-School Hexer", Masako maintained that there were no spirits involved despite the spiritual phenomena that kept happening. She was unable to see anything because the spirits were created by hitogatas. Later, she incorrectly identified the spirits in "The Cursed House" as "empty" spirits, despite the fact that many of them held a grudge against the family because they were being used as servants by Okobu-sama.

There is some discussion between the characters about the exact nature of Masako's powers, as well. By Oliver Davis' classification, Masako would be an "imperfect medium"; when she channels the spirits, she will only speak in Japanese, no matter what language the spirit spoke. Therefore, it is unclear whether she is truly channeling them, or merely using some form of ESP or psychometry to sense their motivations

Masako has a slight British voice and sounds sophisticated  

for an example of her voice: https://youtu.be/H5vAbm2l4nE?t=1m2s