i have a tip for peach/sheik teams:
pink shinobi i watched videos, and you play similar to my friend Kim. pretty aggressive with the dsmashes and pretty fast overall, but you do some random moves. very, very similar play style... except you are probably better than he is IMO.
it just so happens that he is my main teammate now, and we are gonna use peach/sheik team in brawl cuz they are so cute! (sakura and ino team, we like to call it.)
he used to hit me a lot also in teams, but he is getting better at it. ALSO we are getting better at it because it is the sheik's job to hang back from peach and not get hit, because peach's priority in teams is TOO HUGE to get near her.
if the sheik stays near but not TOO close as to not get hit, then sheik can be peach's support when she gets hit. peach is a lil too slow to go help sheik when shes in a pinch, but if the sheik is nearby then peach can do it. team synchronization has to be pretty precise, and if you can pull it off, they are a freaking cheap team and hard to beat. the only bad part is that neither character can team-gimp very well, not like fox or jiggly or marth or falcon. but if both players are solid (which is common with peach/sheik players) then the team should overall be good naturally.
so if you do decide to team with vans, or play team friendlies or whatever, discuss this strategy and use ur guys' strong points. because peach and sheik are both really amazing in teams, and BOTH characters can spam dsmash all day and get away with it. its really cool.