Quoted By:
Mr. Koro's membership doesn't really offer that much. Maybe once a month you'll get either a watch along stream, ASMR where she gets embarrassed and turns it into a comedy skit, or some zatsudan. You'll also get the occasional wallpaper or her doodles. Her chat's emote are pretty good though.
Like most people here, I only bought her membership to support her. Even Korone admits that she feels bad for not putting out enough member-content. Personality wise she's pretty much the same person inside and outside of member stream. You do get to see her more vulnerable sides I suppose. She talks about what's bothering her, or just family stuff in general.