Arcs: One or Many?

I'm working on coming up with the arcs for my campaign, but I'm not sure whether to do multiple arcs (one centred on each of the four hunters), or come up with one central arc and somehow weave a connection to each of the characters into it. How do other MotW Keepers do it?

Don't aim for a set number - one per hunter is almost certainly too many at the beginning!

A few classes right away point to an arc (the Chosen, Wronged, for example) but many do not.

Possibly the history choices the hunters made, and the backstory they created about the team will suggest something as well.

So, look at what you've found out about each hunter's background and see if a big plot comes to mind. If not, leave it for now and see what happens. If it turns out to be important, it will come up in play when you ask them questions or as the results of what happens in your mysteries.

Overall, don't worry about the number of arcs. Just look for a particular monster, place, or group that seems really important because of what you've found out in play, and make an arc for them when that happens.