Equivocation.  If the mimic's miniature is within 1 inch of any part of a player or a player's character sheet, the mimic treats the associated character as if it were within 5 feet of the mimic, regardless of the mimic's actual proximity to that character,

Extra-Dimensional Movement.  The mimic ignores barriers, difficult terrain, or other obstacles unless such they are represented by a real-life 3D structure on your map.  The mimic's movement is not confined to the game map.  While moving outside of the map where a player's character would not be permitted to follow, the mimic has total cover, and the mimic's movement speed doubles.  If the mimic ends its turn off the game map where a player's character would not be permitted to follow, it takes 5 (1d10) force damage.

Forced Perception. The mimic is considered to be a Tiny creature when being Tiny would be beneficial to the mimic.  When it would not be beneficial for the mimic to be Tiny, it is considered Medium.

Reification.  Whenever a player touches the real-life miniature or token representing the mimic on the map, that player's character is subjected to the mimic's Adhesive trait and is considered to be within 5 feet of the mimic while it is grappled by it, regardless of the character's actual proximity to the mimic.

Shapechanger. The mimic can use its action to polymorph into an object or back into its true, amorphous form. Its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.  The mimic has a pedestal or stand beneath it in all forms it takes.

Adhesive (Object Form Only). The mimic adheres to anything that touches it. A Huge or smaller creature adhered to the mimic is also grappled by it (escape DC 13). Ability checks made to escape this grapple have disadvantage.

False Appearance (Object Form Only). While the mimic remains motionless, it is indistinguishable from an ordinary object.

Grappler. The mimic has advantage on attack rolls against any creature grappled by it.

Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) piercing damage plus 4 (1d8) acid damage.

Fourth Wall Quake. The DM gives the table a single shove (use good judgement and common sense; do not flip your table for a fictitious monster's novelty ability or cause anything on the table to be spilled). 

A character whose miniature is knocked over falls prone.  If a character's miniature is moved during the shove, that character is considered to have been subjected to a forced movement, and now occupies the nearest vacant space to its new location.  This forced movement cannot be reduced by any game effect.  If a character's miniature falls off the table as a result of this action suffers the effects of the banishment spell. 

All these effects also apply to all other creatures in play on the table, including the mimic.