Comments on the Pixiv post are saying it's Chris, which lines up since she's the only ex-holo with brown hair
Worth noting is that the three of them were the only bona fide terminations in Hololive, and the three of them have their backs turned to the viewer. Aloe has her back turned too; she technically wasn't terminated, but her departure was still particularly inauspicious.
In light of recent events I felt like I needed to come back here and bask in the glory of what once was, to try and forget this cursed timeline we are now in.