My response is purely my opinion, and you're welcome to comment below with changes you would make. But this is what I'd advise personally:
A specific 'ice-breaker' isn't going to be necessary, especially as you're the new one, not them. Even when you have a class full-time, my advice would still be to get into the learning as soon as possible, setting the long-term standards, and learn about each other along the way. I'm sure there are many teachers that give out a neatly compartmentalised grid with the children's hopes, food dislikes and favourite subjects scrawled across, but I doubt they do anything of any value with it; I'm pleased you're ambitious, I won't be cooking for you anyway, and you can love or hate every subject, it's still going to be taught to you!
You must keep in mind that, at some point, you're going to be responsible for the progress of these children (whether it's a placement or an employed post), so while you obviously want to get to know everyone, and for them to know you, you must ensure that you keep control of your image. By this, I mean that we are so keen to tell everyone our quirkiest talents, best adventures and funniest stories in an understandable bid to be liked, and all these episodes build the picture someone has of us.
With this in mind, consider the picture you want (and ultimately NEED) the children to have of you. Eventually, you're going to need them to feel safe with you, listen to you, in order to create the best outcomes with regards to learning. My advice would be, everything in moderation:
Being their friend first, and teacher second is never going to work. They're going to fall in love with you regardless. They want someone who is going to work hard for them, and they'll work just as hard for you. Best of luck!