ZardyDav (the OC, not the creator of this post) has a tattoo on his chest that references the creatures he made a pact with

And whenever zardy makes a pact with a creature, another symbol is added to the tattoo.

The tattoo has the appearance of a circle with several symbols around it referencing the creatures that zardy made a pact with.

The symbols are:

• A yellow rabbit referencing William Afton

• A endoskeleton head referencing the mimic

• Bendy's head referencing the ink demon

• A triangle referencing the bill cipher

• A blue rabbit referencing "bon"

• Trollface's head referencing trollge

• A lasagna referencing gorefield

• Red's head making...well, the reference to red was kind of obvious

• A smiling white face referencing Happyness

• A sad black face referencing Sadness

• A Dornes display of murder drones referencing N0P

• A black fireball referencing the auditor

• A Mickey mask making reference to undying aka henry miller