The time travelers sounds like a fun idea. What historical events were you thinking of visiting? There was a sci-fi tv show about this concept, I just can't think of the name right now.
I'll look at people's profile and then their recent posts. This give me the best idea of their writing style and length of posts they are looking for. If their posting style doesn't match what I'm looking for I'll pass.
1vs1. I like fast responses with multiple posts per day. That is more difficult with lots of people. There's always one person in every large group who has a life that gets in the way.
Post order is terrible for ghosting. Without post order, people who are interacting with the ghoster are stuck waiting, others can continue on. With post order, everyone waits. The roleplay literally stops.
Inexperienced witch/mage whose spells sometimes go wrong. My favorite is conjuring creatures that have a mind of their own. They usually start off doing the intended task, but often get diverted by their own desires before the task is finished, or the perform the task in an unintended way that...