Both Brinks possess the ability to impersonate/mimic other creatures. However, it can be difficult for them to take a form they are not used to. For example, that edgy scribble half cat half human Dark Brink thing I did a while ago is one of his first attempts at taking a human form. The Brinks are more used to the forms of their Champions, as they can possess them more easily and they are more likely to consent to being possessed.
When taking this mimicked form, not everything about them is exactly like the original - Dark Brink's form tends to look darker and Light Brink's form tends to be lighter. As seen in the picture, the hair DB has while mimicking Mortikai isn't the dark blue it usually is. There are also certain qualities that the original has that the copy doesn't. These things are usually of items of sentimental value, such as Dispair's bullet necklace. The eye colour will also change: DB's will be between the original eye colour and dark red (with Morty's dark blue making a pinkish-purple), LB's will be between the original and light blue (with Dispair's orangey-red making a yellowish green).
They can't hold this form for long, as it will drain their power and will leave them weak. They usually take this mimicking form for manipulation or purely to disguise themselves.

#DTWdarkBrink
#DTWlightBrink
#RKthesanctuary
#lore #impersonation #shapeshifting #vignette

also hey look the first shown design of human Dispair :')