These rabbit kaomojis use U characters to make big floppy bunny ears.

Big Floppy Ears
U・x・UU。・.・。UU=・ x ・=U
U=๏ x ๏=UU ´꓃ ` UU(,,๏ ⋏ ๏,,)U
U(•ㅅ•)UU(ㅇㅅㅇ❀)UU(⁎˃ᆺ˂)U
U(´・×・`)UU(´・×・`)UU( ÒㅅÓ)U
U(,,Ő x Ő,,)UU(╹ૅ×╹ૅ)UU( ´•̥ו̥` )U