This one hangs at the very bottom among the paper cranes. It is roughly folded, but the bold character for "Mi" is strikingly familiar.
Unfolding it reveals a child's wish:
"I, Mi, along with Su, will become two of the Three Paragons!"
Beneath it, a note in flowing cursive reads:
"That leaves you one short. Mi, you must work hard to find a third companion."
Letter