Shen Hui, who travels through various timelines, opens her eyes one morning and discovers she isn't human anymore?
Shen Hui: Wait, the contract never said I'd get a nonhuman identity!
System: (Pulls out a sheet of paper and points to the tiny print at the very bottom.) The System reserves the right to assign mission identities.
Shen Hui: ... (She looks at herself in the mirror, covered in yellow feathers, with two little tufts on her head and bright red cheeks.) ...Am I supposed to do my missions looking like a cockatiel?!
Theme: Encourage people to treat small animals with love