Marcus would most likely head off to see pre-war Terra and then try and find a uninhabited to avoid going crazy. And Seline would go looking for Omicron IRL to "Un-alive" the person who's been causing her endless headaches.
Sid Fire: "Uh, good community! I Could have some ideas for you to keep it well. However long live the queen!" Ar Sogan: "Pfui! Do these useless clumps of meat know to do just this? Go to work you good for nothing!" "Wreckter": "Oh, I like to know new and various communities! Let's socialize! I'd like to help you all, nobody excluded!" Carl Benson: "Oh... I hope that someone is passionate of science and discoveries like me ^_^" All "Madze" entities: "We are at your orders!" Remì Maser: "Oh no... I could be a bother! N-no, thanks I'm not interested about you, c-continue to do what you want like if I wouldn't exist..."
Aya: Would attempt to make all Kusari players accept her as their rightful ruler
Misaki: Would start making daily flood posts about random topics.
Mariko: Would start educating people on geisha culture. Likely making a tutorial on proper mannerisms
Yume: Would just lurk.
Rin: Would start helping newbies in penny.
Megaera: Would start a cult around herself