He's gender-fluid, because of his aura, his body can shift into whatever gender he is feeling for that day. It shifts automatically without his control-even if sometimes it shifts to something they're not comfy with-he doesn't have control over it.
He's from the time the big flu pandemic hit in 1918, being an immortal being, they had a big mental breakdown when quarantine started
On brighter news, they are married to Wilford for a good while, they had their wedding in spring-where Dark's favorite trees (cherry blossoms) started to bloom.
Many would assume she would love sour and bitter things....she absolutely despises them. Out of the Ipliers, they have the biggest sweet tooth alive
Once, she ate a crap ton of marshmallows that Dr.Iplier had to put a rule that Dark can only eat 1/4 of the marshmallow bag while being supervised.
While they are the shortest ego of them all, don't underestimate her power. They're a lot stronger than most think at first...
While he likes all types of animals, Dark once met a cat and slowly started to fall in love with cats. Wilford surprised him with a new pet cat, a tuxedo cat named Buttons
He's very protective about his family, counting everyone at the manor as a part of his family. So Dark has a gun hidden in their shared room with Wilford. Besides Wilford's gun-Dark owns his own. She's only had to use it once.