i've gotten a lot of good roleplay from MMOs. my longest running characters all find their homes there. i've done a bit of writing on tumblr as well, as well as some RPI (roleplay intensive) MUDs (look it up if you don't know).

the first MMO i took to writing in was Mabinogi, and I've been playing that particular character ongoing for the last 13 years.
the second MMO i've spent a lot of time in is FFXIV. my oldest ongoing character there is 7.

these characters have marriages ranging from lasting 3-11 years. they have children that are growing. i have a child that was taken in as an apprentice and is now an adult and has lived through cataclysmic events, drastically shaping their character.

genuinely can't recommend MMO roleplay enough. an evolving world does so much for a character's story.