If Hashirama is a bonfire, bright, attractive, and larger-than-life, then Mito is slow-burning embers.
He had been pledged to her cousin. She had been sent as an accompanying attendant on Naha's first trip to the Senju stronghold. In truth, the role she fulfilled was more bodyguard than maid, not that Naha needed a maid. (There is no such thing as a spoiled Uzumaki.)
If Hashirama warms, then Mito ignites.
"May I speak with my betrothed?"
"It is midnight."
She pins him with dark, smouldering eyes and they are lost. Cousin Naha is prettier, her body more delicate and her features finer, but it is not fiery hair that he wants.
If Hashirama goes out in a tempest of flames, then Mito endures, until the last of the coals of duty lose their glow and crumble to ashes.
Notes: I took the liberty of creating a random Japanese name for Mito's cousin. Since Mito is probably taken from the name of a prefecture capital in Japan, I chose one that sounded vaguely like a name from a list of capital cities. (Hopefully it doesn't translate into something odd.)