I choose Amiya, she is so cute!

Arknights Fan Art ContestAttention all Arknights fans! Enter the Arknights first anniversary contest, Operation: Fan Art, with over $18,000 USD in prizes to be won. 1st place wins a Wacom Cintiq 22, a professional tablet, and more! #ArknightsFanArtDA
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Fan Art Contest
Enter By December 26, 2020 at 11:59 PM PT
In celebration of the game's first anniversary, Arknights has teamed up with DeviantArt for a classic fan art competition. Create fan art of one or more existing Operators from Arknights Global Game and you could be a winner — there is over $18,000 USD

https://www.deviantart.com/ayyasap/art/Battle-Amiya-865186323