Currently, my most watched would be Kanna Yanagi. (probably a bit obvious with how many of my posts include her)
I think why I watch her so much is because she’s reliable. She’s streams a lot, so there’s always more to watch. She maintains a comfy and wholesome vibe, so I don’t have to worry about “stuff” like world news or internet drama while I watch. The big collab events she joins or organizes are also a bonus.