Opposed by: Lucifer, and for that matter, the entire Chaos Pantheon, Benevolent creator-figures (he gives them a bad name), Sosuke Aizen (Aizen sees him as an obstacle to his ambitions), Shu Shirakawa, the GUAG Sisterhood... pretty much everyone with a modicum of Free Will, which is to say, EVERYONE NOT LISTED UNDER "ALLIES".
Apart from the ones hailing from his own multiverse, his "followers" listed above don't so much follow him as work toward the same goal, as they're all fairly powerful themselves and would gladly try to take over his portfolio if given half the chance. However, given the massive legions he has amassed, none of the competitors come nearly close to challenging his role as the Overdeity of Law.
YHVH is also highly intolerant of other Top God candidates, outright seeking the annihilation of all other Creator Gods with limited success. He refuses to acknowledge the existence of any Creator who has proven stronger (not that there are many), and indeed, many of the friendlier Creators prefer it so, given the kind of press he generates for them. While there have been countless attempts to overthrow him, the desire to return to the stability and order he promises is too great, and as many times as he is destroyed, he invariably comes back. This is why he mocks any and all attempts to remove him from the human spirit or from the Throne of Law. And why he regards the "Pantheonic Rebellion" as a particularly funny if stupid joke.
Through the power of Kagutsuchi and the Conception, he constantly creates and destroys universes in an eternal quest to create his perfect world, studying the variables of Humanity and how to manipulate them better, so he can ultimately purge them, no matter the cost, on every world and every timeline, of The Evils of Free Will. This worked so well some believe Shinryu might have been cribbing ideas from him.
He's the ultimate incarnation of the concepts of Law and Tyranny. It's spoken he was once a benevolent god, but was driven to insanity and corruption by a massive flaw in reality - there is literally none who remembers how he once was. Few are willing to broach the subject, either for fear of provoking him... or finding out what he has to say. Even worse, nobody's sure of exactly what was/is the flaw in reality that caused the shift. Efforts to find out what this was and eliminate its influence on the Mad God have all failed miserably.
There was this one universe where he tried being more empathetic. More or less worked, except that due to an earlier act of dickery (orchestrating the whole Abel And Cain scenario to create the first martyr and the first murderer) what seemed to be a perfect plan for the domination of Law got derailed and he had to settle for at least preventing that Earth from falling into absolute Chaos. Metatron was ordered to take a note on the incident, file it, and lose it for a while.
He personally has little interest in the Pantheon (he isn't even around most of the time), though he regularly sends envoys and avatars to oversee the situation.
His legions, while completely loyal, seem to have various degrees of understanding as to what exactly His will is. Most glaringly, the Four Archangels have twice created societies based on deep classist principles against His wishes. Satan is loyal to the principles of Law, not necessarily to Him, Merkabah is half crazy but has a firmer grasp on Law's tenets, Mastema ping-pongs between a selfish jackass and a genuinely helpful Guardian Angel, the Ancient of Days is merely a killing machine, Kuzuryuu was created without a will, the Demiurge is obsessed with sealing all human souls in the physical universe, and He no longer bothers to try to track Samael's allegiances. His sole actual link to the Pantheon and Speaker of His Will is Metatron, but the Voice cannot be everywhere at once.
To this end, He has been meeting with fellow tyrants Darkseid, Palpatine, Dolores, Arthas, Friday Monday, Megatron, Starscream, Scorpanok, Nerissa, Gi Guy, Red Skull, Lex Luthor, Destro, Copy X, Frollo, and Seymour Guado about forming a "Regime". This news brought great worry to the pantheon, especially to the Sisterhood given his recent plot against Madoka.
Brings in criminals for investigation whenever Captain America is busy, known for his cynical and sarcastic comments during meetings. Makes many of the more political gods nervous, as his ancestor once executed the king of the gods when no one else would.
Every day, without fail, Commander Vimes must be home at six o'clock sharp to read the book Where's My Cow? to his son young Sam. Because some things are important.
Phoenix Wright, God of Objections and Turnabout (Nick, Trite, Mr./Phoenix Wrong)
Allies: Iron Man - on Earth their friendship was rather strained due to Civil War, in the Pantheon strained further when Iron Man built himself a Humongous Mecha and attacked Starscream with only verbal provocation... They're not speaking right now, but that will change the next time they team up.
Enemies: Many with the Evil alignment... Sally Floyd in particular, as she has not actually attacked or caused others to attack him yet, so Cap will not attack her or cause her to be attacked.
His mortal shell was recently killed, and he can currently only manifest on Earth in dreams and flashbacks. Cap doesn't like to request offerings, but he greatly enjoys the grief of the mortal version of Tony Stark, watching his successor avenge him, and granny smith apples
He's watching you—you are editing this on a telescreen, right?
It's true, the passing of the Eighties has greatly lessened his menace, and he has been forced to resort to selling ridiculously outdated crap in a bid for capital. But his influence has stayed strong, and Big Brother has begun branching out into Reality TV. Someday... someday, he will take control of the Faceless Masses.
The Guru of Time:Created entire multiverses that he knew would lose to the Time Devourer, because that would set up just the right scenario, the right time, the right choice. Yuko was forced to concede that that wasn't bad.
Frederica Bernkastel: A humble explorer who made a deal with Yuko in order to be able to explore the multiverse she created. The cost? Hundreds of years of dying over and over for a child's game.
Allies: Komachi Onozuka (Direct subordinate) King Yama and Koenma (Fellow Yamasnote She no longer associates with Enma after finding out how he was padding his accomplishments with brainwashed demons
The Yama of the Paradise land of Gensokyo, and the representative of Yamas within the Pantheon. Her job is to judge the dead to be "White" or "Black". That is, good or evil. As the Yama, she has the singular power to unerringly judge any person or deed to be "White" or "Black". Once a soul has been judged by the Yama, there can be no appeal; no turnabout. The judgement is final.
However, despite her professionalism when she is on the job, she spends her time off lecturing the still-living on how to correct their lives. It his her opinion that Hell exists so that no-one sins, not to punish sinners, so she does what she can to make sure as many souls as possible can be judged "White" when the time comes.
The authority of the Yama is absolute. Everyone, from the lowest insect to the highest of gods, are judged by the Yama when their time comes. No life is truly eternal; no person can avoid their destined appointment with the Yama.
Despite this, she has immense trouble keeping her own ferryman Shinigami in line.