Ok, as far towa's most recent stream goes, the only sus person she could be referring to is
https://www.youtube.com/@user-gt6wd1xp1qThey commented a total of 31 times. Most of which was emote spam, but also said shit like "かわいい" 3 times, "おかえりー", "お疲れ様でした~!", "ウィンク助かる", pretty deredere like. Literally naming yourself nekofami seems way to on the nose, nor do I see how'd she recognize the person, but idk.
The others she could have been watching are Kanata, Lui, Koyo, Iroha, and I guess a non-holo. Before that Subaru 5 hours prior, but that seems to long for the timeline.
Need to get some sleep as to not die for the new years stream, so I'm not checking the chat of anyone else till then.