Porthos

Chaos, tranquility, nothingness. In some far corner of the universe, where nothing comprehensible exists, an undescribable blob split into many more little blobs, each generating incredible qualities due to the way nothing had logic or made sense. Porthos, the creepy portal, was one of many blobs born from that event. Sent to habitate Earth with other blobs, they all had the mission to not bother the living beings of the planet unless extremely necessary. Of course, that would've been boring, so the group agreed to help earthlings only sometimes, as a little treat.

Expectedly, Pongo's sudden attack on Earth is what would count as an emergency to the dimension rascals, so they are willing to help the planet's inhabitants against this looming threat.

Porthos possesses the gift of multiverses- something kinda hard to explain. To make it short, Porthos can create portals between alternate realities. These realities can be simple parallels without much differences, or entire alternate universes. It's rumored that interacting with these can irreparably damage the timeline, so Porthos has been advised to not abuse it, under any circumstances.