The embodiments of Marvel Comics and DC Comics

The Brothers getting ready to throw down.

 

Name: The Brothers, The Amalgam Brothers, The Brothers Yin and Yang
Origin: Amalgam Comics (DC Comics/Marvel Comics)
Gender: Innaplicable, appears male
Classification: Cosmic Entities, Embodiments of "the whole of everything"
Age: Innapplicable
Powers and Abilities: Super strength, speed, durability, reality warping, can merge to become an even more powerful being, matter manipulation, energy manipulation
Weaknesses: None notable
Destructive Capacity: Megaverse Level+, likely Nigh-Omniverse Level (are the embodiments of DC Comics and Marvel Comics, their combined power destroyed and restarted Creation) | Nigh-Omniverse Level | Megaverse Level (are the guardians and embodiments of megaverses)
Range: Nigh-Omniversal Scale | Megaversal Scale
Speed: Omnipresent | Omnipresent within their megaverses
Durability: Megaverse Level+, likely Nigh-Omniverse Level | Nigh-Omniverse Level | Megaverse Level
Lifting Strength: Immeasurable
Striking Strength:
Immeasurable
Stamina: Infinite
Standard Equipment: Golden swords
Intelligence: Are nigh-omniscient about their respective Omniverses | Unknown, but likely nigh-omniscience about their respective megaverses
Notable Attacks/Techniques:

Notable OBD Victories:

Notable OBD Losses:

Other: Pre-Retcon, the Brothers were the superiors of the Living Tribunal and the Spectre. Post-Retcon, they were created by the Living Tribunal as an experiment.

Pre-Retcon for the Brothers generally means their appearance in the glorified popularity contest Marvel Versus DC/DC Versus Marvel up until The Adventures of the X-Men #12.

Post-Retcon for the Brothers generally means any appearance in Adventures of the X-Men #12 and beyond.

The power of the Brothers is Pre-Retcon is explained further here. The power of the Brothers Post-Retcon is explained further here. Specifically, this quote:

"As seen in the DC vs Marvel limited series, the Brothers encompass their entire respective multiverses (i.e. The Marvel Brother encompasses both the mainstream Marvel universe and its alternate realities such as Earth-Days of Future past etc.) It extends beyond just their Multiverses, though, as realms such as the New Universe, outside of the mainstream Marvel Multiverse, were affected. However, they do not encompass the entire Omniverse, only DC and Marvel Megaverses. The Omniverse is the term used to describe all realities and all multiverses, whereas Megaverse is a term (coined by Snood) which is used to describe all multiverses within one line of comics. All of it is within the Omniverse, whether or not it is in the comics. For an in depth explanation of the Omniverse and the other terms along those lines, click on the link below. 

Omniverse

In--of all places--The Adventures of the X-Men#12, the hierarchy of the Brothers (as higher than the Living Tribunal) is disputed. This is a somewhat interesting series, as I had initially just assumed it to be adaptations of the X-Men cartoon. I watched the first season or two, but didn't continue to follow it, so I can't confirm or deny this as being the case. However/Anyway, in this issue, the demons D'Spayre and the Dweller-in-Darkness instigate the destruction of the M'Kraan Crystal, which in turn destroys all reality. Phoenix harnesses all of the positive emotions of everyone in the universe and uses this energy to have the sentience of the universe join with Galan of Taa and allow him to survive the destruction of the universe, and to ultimately become Galactus in that Universe. So, the implication is that the events of that series (and possibly of the cartoon) took place in the universe before the current one.
    At any rate, the relevance is here: During this conflict, the Living Tribunal is seen to be holding the Two Brothers in the palm of his hand, as he goes to consult with his "hooded, spectral ally" (clearly the Spectre). As the old universe is destroyed, the Tribunal releases the Brothers to "assume their pre-destined roles as architects of new realities."
    So, while the Adventures of the X-Men is not quite official canon, the book was written by Ralph Macchio, with the assistance of Mike Carlin, indicating that both Marvel and DC were involved in this explanation. The Brothers are thus intermediary in power and authority between the Living Tribunal and Eternity (or their comparable counterparts in the DC Megaverse). However, each Brother tends has some authority and control over universes outside the standard Multiverse, but within the Megaverse, while the Living Tribunal has not been shown to have authority over worlds outside the Multiverse.
    --Snood."

Key: Pre-Retcon, Separate | Pre-Retcon, Merged | Post-Retcon