Is the thin, viscous, white, odorous fluid that is discharged upon waking from sleep considered maniyy or madhiy, especially given that it has an odor while madhiy is odorless, and all fluids he has are odorous?

Madhi is a thin, sticky fluid. Mani is a thick, white fluid, and its smell resembles the smell of dough or palm spathes. If you can distinguish between the fluids, then perform ghusl (ritual bath) if it is mani, and perform wudu (ablution) and purify what it touched if it is madhi. If you are unsure which of the two it is, then choose and assign it the ruling of whichever one you wish.