yuán​xíng

original shape

原形 yuán​xíng
original shape noun
the original physical form or shape of something

Legend has it that this goblin will return to its original form once its magic disappears.

true colors noun
one's true character or appearance, often hidden under a disguise or exposed through investigation

In the face of evidence, the fraud finally showed his true colors.

Frequency

Movie subtitles
2.06 per million appears in 1% of films
Written text
1.75 per million

Sources

Definitions
CC-CEDICT