Verse-Diving

Verse-Diving (sometimes referred to as Realm-diving or verse-hopping) is an ability possessed by only a number of OCs, granting them the power to traverse realms that are not normally accessible to other characters. The term was coined after the Dive Mode system in the game Kingdom Hearts: Dream Drop Distance.
Diving is being overseen and monitored by the Multiverse Equilibrium Observatory.
==Divers==
People who verse-dive are called Verse-Divers or simply Divers, not to be confused with a person who enters water from a height, or those who participate in deep-sea diving. They are able to open rifts into the Multiverse and travel as they please.
Their primary duty is to patrol the worlds and set any anomalies or imbalances straight. These imbalances can range from something as mundane as an object that is not supposed to exist in that particular world(like a mecha that got lost in a medieval realm) to something dangerous like a character accidentally getting lost in another world (i.e. DMCverse's Berial finding himself in Mario-verse, as ridiculous as that sounds, it is possible).
They are also allowed to aid people in the worlds they visit; if they find no anomalies in that certain area, then they can simply assist the residents on tasks such as defeating enemies and the like.
==Guidelines and Basic Principles==
Verse-Diving is a very complex and sensitive matter since it involves the balance in between worlds. As such, there are a few principles that must be followed, known as a Diver's Tenets.
*First Tenet: A Diver is not allowed to mention anything from another verse, unless it is either a)of great importance, b) they have clearance to do so, and/or c)if the person they are talking to is aware that the Multiverse exists.
This is to prevent confusion among characters who have no idea of other realms existing.
*Second Tenet: Memories from a world visited in the past are retained when a Diver returns to that world. 
This tenet is more of a principle than a rule. For example, a Diver who has visited the Metal Gear verse will recall the place, characters, and what happened to them during their dive, depending on what era they had visited in that world.
*Third Tenet: A Diver must maintain a sense of unfamiliarity with the realm, even if he or she has visited it before.
When a Diver dives into a realm, they have no control over what Layer they’re gonna land in. That is why whenever a Diver sets foot in a realm, they have to be careful not to act too familiar with the residents. Having met a Dante on your last visit to the DMCverse does not make ALL the Dantes in there automatically know you.
*Fourth Tenet: A Diver's existence is then nulled after Departure. This is to protect the balance between worlds, and also to prevent confusion when the Diver leaves. 
The hardest part of being a Diver. The friends the have made, even deeper relationships—all of those will be gone once they leave for another verse. When the Diver returns to that realm in the future, the residents of the verse will know nothing of them, as if it was their first meeting. Unless, the people they knew will it hard enough to not forget. On rare occasions, a Diver can leave something of their possession behind for the people to remember them by.
But the remembering process with the items isn’t easier. Once the Diver leaves the verse, their existence in memory resets, making them non-existent. The item they left behind, however, will stay there, and the person they entrusted it to MUST try their best to remember the Diver. Sometimes, to those with the strongest bonds, the process only lasts days, others—months, years… some don’t get recalled at all.
SOME OF THESE RULES, HOWEVER, DO NOT APPLY TO INDIVIDUALS WHO HAVE BEEN EXPOSED TO THE MULTIVERSE.