Tweedle-dee and Tweedle-dum again are a must have when presenting a full scale Alice in Wonderland themed event.
Quoting nursery rhymes, which the two brothers then go on to enact. They agree to have a battle, but never have one. The Tweedle brothers never contradict each other, even when one of them, according to the rhyme, "agrees to have a battle". Rather, they complement each other's words.
They can be plain comic roving characters, Adagio Acrobats or again adapted for an aerial or stage show.