OK, seriously, full spoiler warnings in effect here! 
So, first of all, you all should be aware that I left a lot of clues to the fact that Kiyoshi was Hakuba in her first scene. A lot of Kiyoshi’s dialogue is very clearly being answered as Kaito, once you read it knowing that a version of Kaito is behind Kiyoshi’s existence.
Second, a note about ‘her’ name. I can speak and write a little Japanese and I like playing with name meanings when I can; I also note that fanon!Kaito is very fond of wordplay (even if people have of late been arguing that canon!Kaito is less into heist notes than the fans think of him being). While it’s never given in the text of the story, Kiyoshi’s given name is written in kanji as 白. KID’s used an anagram of his title as an alias before; in this case, Hakuba just borrows a kanji from a previous alias–the “ 白” (haku) from 白馬 (Hakuba).
Finally, for anyone curious, here’s what the Kiyoshi disguise looked like, along with one of the doves:
