My closest in age is Edmund Pevensie who was an early arrival and has been here for a little over three years. He's 22, and will be taking the bar exam at the end of February, so he's kind of buried in books, but he's Ed, so he's friendly.
Mordecai is Mordecai. He's a little more cagey than he is at SA. He's not a whole lot different, but he's closer in canon point and outlook to when he was there the first time, didn't have his soul, and was convinced he'd be heading to prison in his own world. He's been around since April, is on the SadTech board, and is kind of the person to talk to about magic stuff, so he and Hope and Julia should talk.
Marcus just arrived at the beginning of January, has SA history up to that point, and is a little frustrated with everything right now.