I was not here the time bandit appeared the first time, so I have no idea how to unlock him. When I started to toss items in the bonfire this year, he appeared several times before the rreign came. But I do not find him under the event tab at the battle coliseum.

- Unless it has changed - This challenger can be unlocked by attempting to throw an item into the bonfire only to have a Jollin steal it away (it may take a few attempts before you unlock him). Good Luck!

Thank you! When I started this year at the bonfire I remember bandit appeared several times, but I cant remember of he stole an item there. But even he appeared, I cant find him unlocked under events.

- if you think that you should already have unlocked Bandit but he isn't showing up, then I suggest you file a ticket. (Of course, you could also just go back to the bonfire and see whether you can unlock him now - if it still doesn't work then a ticket is the best option.) Wishing you best of luck and happy holidays either way.