Encounter: The Ultra-Entrope known as Detective John Munch.

While normal Entropes
are terrifying creatures that gnaw holes in the borders between the
various Inner Planes through which elemental forces can leak, this next
step in their evolution is actually a bit less dangerous–maybe. The Ultra-Entrope is the result of a heightening of their powers, enabling
them to perforate borders between whole Multiverses, so rather than a
geyser of elemental dust or a hole that sucks in life force, you just
get adventurers or monsters from whole other planes leaking in…bringing
their problems with them. While Detective Munch appears to be a normal
gruff law enforcement officer, he is actually an agent of some
higher-plane power that wishes to unify the various realms of the
Omniverse. By appearing in a realm, he officially connects it with other realms he has visited, linking them together into a shared multiverse.

In related news, Hasbro and IDW stopped just short of fully crossing their D&D comics
in with their Transformers/GI Joe/Micronauts/Jem/Visionaries comic
universe (which would also have included Candyland, Stretch Armstrong,
and later it crossed over with Ghostbusters, Ninja Turtles, X-Files,
Star Trek, and probably others)…

Encounter: the Numbertaker. If you haven’t seen the British preschool show “Numberjacks” he’s a little hard to explain beyond ‘strange man with a pathological kleptomania towards certain numbers’, so I’ll let their wiki elaborate: 

He causes trouble by taking numbers and “numbers of things”; as numbers themselves, the Numberjacks
have to be particularly careful when dealing with him. The sleeves of
his long with coat hide various attachments with which to steal numbers –
a number-sucker-upper, a number grabber, a net, a magnet, a long
pointed pole, a hook, and sometimes just his own hands. He neither
speaks in any of his appearances, nor smiles much either.

Irrelevant note: I swear this dude feels like a “Doctor Who” villain.