The title was revealed on November 30, 2018, along with the release of Savages and the whole track listing.
Through an Instagram live streame on January 15, 2019, Kerli stated that Mimicry was one of her favourite songs off the album, along with Giving Up the Ghost.
The song was written by Kerli herself, along with Even Sarucco, who also produced the track. Mimicry shows musical similarities with Everybody Bleeds the Same, both of which run at 80 beats per minute and are composed of two verses, a chorus, and an instrumental break. The song features an airy, ambient atmosphere, along with an electronic beat during the musical break. Lyrically, Mimicry shows Kerli singing about her own fragility, and refers her trying to be with somebody who does not care for her the same way she does for this person.
On March 11, 2019, Kerli posted on Instagram that both One and Mimicry had been uploaded by MrSuicideSheep on YouTube. With Kerli's intention of releasing a fourth single off Shadow Works right after the album's release, it is possible that either Mimicry or One can be chosen as singles, or at least, both songs can be considered promotional singles.