>>4337415>>4337611>>4336040It's called Burikko and most who do it have been doing it for years. Luna is an example I think of someone who can't turn it off because she has done it so long, if you dig deep it's been a long time.
The burikko subculture is an example of adults embracing child-like behavior and speech as a form of cuteness, also seen in South Korean aegyo or Chinese sājiāo among others.[4]
Behaviors associated with burikko include "kitten writing", a rounded form of handwriting characters, as well as forms of baby talk "to sound like children learning to speak".[5] As part of this childish way of speaking, people may refer to themselves by name as though they are talking about a third person. Burikko may also include a nasalized pronunciation, high pitch, amusing or light phrases, and mannerisms such as covering the mouth when smiling. Vocabulary will also convey burikko, by using melodic, sing-song vocabulary or onomatopoeia.