During his time away, he became the Warden of the Sanctum, and often took missions to look after the wildlife, which caused some of the life itself to not be afraid to show themselves to him, despite his much different and overall darker appearence. He often finds himself sitting in different trees to take a break, and some birds sit nearby, or on his lap to keep him company.
Dark sometimes visits "Young Valley", where creatures known as "Bicorns" reside. He takes care of the creatures there, and is there first so no Underworld forces attempt to hurt such creatures, but killing a Bicorn is a mistake, since once they die, they release a massive amount of energy killing all darkness surrounding it. While he takes care of these creatures, they treat him as one of their own, protecting him while Dark protects them from harm. He finds peace with the creatures.
Dark appears much more different, being taller than his lighter counterpart, and physically stronger as well, doing work-outs when he gets up, the afternoon and before he goes to sleep as a way to tire himself so he can be up and ready for the next morning. Though, while he is bigger than his other, but not all that much, since while Pit does his sessions in the afternoons, Dark spreads them through-out the day and does them for roughly an hour(Pit does 2-3 depending on his mood, and sometimes skips them).
He also grew his hair out a bit to cover his right eye, as the Sclera there became black overtime due to the Chaos Arc affecting him due to the scars received from it, so he hides it. His left eye is completely visible and the Sclera is it's normal white. Speaking of his right side, his gauntlet there is removed and is instead replaced by a vine, since he works with Vir and not Palu.(However the gauntlet on the left is still there.) His nails have changed as well, with him being able to make them sharp on command, and it can cut through all types of metals, as a gift from Viridi herself.
His attitude has changed a lot as well, now being a "I only exist out of spite, and because I have a family", so he's mostly calm, but tired overall, usually drinking coffee or tea to stay awake, but he isn't drinking it all the time, as he isn't always tired(which is rare to see),
But despite all the changes, he loves his husbando(and waifu) and children dearly, doing anything in his own power to protect them.