Whitebeard the wise wizard, weary from waiting, and wishing it was Wednesday, whipped out his watch, winded it warily, and in a whirl of wildly whooshing winds it was the wanted weekday, whereupon the weather was wonderfully warm and worth his while wielding the wet washing.

--

Woohoo, only three letters left; though by far the three most challenging.

Letter: X
Theme: Succinctness (seemingly the only theme possible with X!)

Drekinn
___
"Let words be your palette."