HOWEVER.
Ultimate majin can generally put up a fight against ANY class, not necessarily have advantage during battle, but still put up a fight one way or another.
But also that, is not exclusive to Ultimate Majins only.
Before we argue about the classes who have the "advantage" over a Ulti who can fight them somewhat equally, would you agree that Ultimate Majin has no concrete counter; A class that generally beats Ultimate Majins in most situations.
And just to reply to the "i am the bully" comment, you were pretty much being a bully. Didn't even bother to try to acknowledge what I had to say, or try to combat my arguments the first couple of times with anything aside from "call me sensei". But that's besides the point, we're passed that stage(hopefully).
Dark Warrior: In terms of beating UM their CCs are rendered completely useless(confuse resist% + para removal), neither party can kill each other. Trying to win by dice is virtually the only thing they can do, maybe they can manage to save a couple of RP balls for the end of the match to KD + bleed(although a perfectly timed senzu counters that) to win by health. As for how the Ultimate Majin can beat DW, they've got burn/Candy(with Duration RP if they need to) with the addition of the same long range KD that DW have. Theoretically if the DW is perfectly geared, they could switch to burn def gear to diminish the ulti's burn and senzu bean. I would imagine in most cases both the Ulti and DW would be evenly matched(Dice decides winner) if both players are skilled.
Plasma Majin: I don't know why you bothered placing this on the list, if DBOG's "top" Karmas such as Horrid can barely defeat you, I don't see why any Plasma in existence would stand a chance against Ultimate Majin. If the Plasma SOMEHOW manages to survive until the end(which I'd imagine in most scenarios they won't), then MAYBE they can win by dice. However in most cases the Ultimate Majin would have a large advantage over the Plasma. With confusion resist% they've rendered almost all of their CCs useless, KD spam without CCs is hardly a threat, and naturally killing the Ulti isn't even an option for the Plasma. Ulti has the advantage.
Karma Majin: Karma is hardly a counter for Ultimate Majin, throughout the fight the Karma is forced to be on the defensive just so that they don't end up being killed by the UM. Karma has 2 tactics in order to beat a skilled UM, that's either to KD them out, or to win by dice; Killing the UM naturally isn't an option(Even if they wear dex). During the match the UM can wear dex because they don't need props to tank the Karma's damage, and they don't need to worry about confusion taking care of them as they won't die, that leaves Skill lock as their only viable tactic against them. While UM with full dex is capable of resisting 40%(approximately) of all CCs that a Full focus Karma dishes out, and if they resist their skill lock the Karma is forced into a position where the Ulti can damage them as much as they want for a little. Since the KM will be using Focus armor that lowers their health to the point where UM has the opportunity of killing them. So in terms of trying to win by dice/survive Ultimate's definitely got the advantage. When it comes to them trying to KD the UM, I would argue that the UM still has the advantage in that regard, solely due to resist though. Assuming that the Karma lands their slow, their KDs, and Skill lock in that theoretically perfect scenario the Karma can KD them out. However, that's if they manage to force the UM near the edge, and have their KDs/CCs/slow ready at the same time. It's not easy to pull off as the Karma is still trying to control the fight in a way that the UM doesn't get the chance to just obliterate them. Ulti definitely has the advantage against Karma Majin.
Grand Chef: Ulti and Grand are pretty much equivalent when they fight each other. Neither can kill each other, nor can KD themselves outside the arena; Thus the match is decided by dice.
Poko Priest: Although I'm not too well versed in Poko, I'd imagine most scenarios would end up being decided by dice. I don't see UM or Poko killing each other, and if it's a matter of keeping their health up, neither party struggles in that department. However, I will argue that Poko would have the slight disadvantage because of their EP. If the UM focus fire the Poko rather than wait for the timer to run out, theoritically they can force the Poko to keep healing until they run out of EP. However, I'm not 100% certain how that would be work over the span of 3 minutes, but I bet the UM can more than likely pull off a kill(although I reckon it's rare, and you'd have to go under the assumption they wouldn't just use pills as a substitute to manage their EP). I'd say they're just about equal.
Dende Priest: Pretty much the same scenario as Poko, however UM wouldn't be able to kill the Dende under any circumstance(nor would they have EP issues). Battle of dice, they're just about even, however UM has long ranged KD and burn that they can use to screw with the Dende last second.
Crane Hermit: Crane Hermit is essentially a downgraded version of Turtle Hermit against Ultimate Majin. They can try to KD the ulti out, but since they have to charge for their RP, 1 out of their 2 usable KDs runs on success rate rather than hit rate putting them at a disadvantage when compared to Turtle. They also can't spam their KDs continuously like Turtle can without sleeping their opponent after 3 KDs. When it comes to damaging the Ulti, I wouldn't necessarily say they have it worse than Turtle Hermit. Turtle Hermit already does trash damage against Ultimate Majins, but if you use burn defense right before your sleep ends(to force them to use Solid burn with power RP) you'll make it hard for them to land enough burns, because they also have to spend the majority of their RP balls on KD. However it isn't impossible to kill the Ultimate Majin either, you can even argue that they have it better than Turtle in regards to damaging the Ulti. However generally I'd imagine the Ulti can survive for over 3 minutes with the use Autopots/Senzu beans. Crane TECHNICALLY has the advantage, but they're not a concrete counter as it can be a struggle as a Crane to kill Ultimates.
Turtle Hermit: Killing the UM isn't an option, and even if they magically manage to land 100% of their Slows/KDs/Sleeps tbey still have to worry about Ultimate Majins removing their debuffs in order to become mobile again. In theory if the Ulti wears move% boots, they can still tank the Turtle's attacks pretty efficiently on top of managing to prevent the Turtle from knocking them off the arena. In order to land all their CCs the Turtle Hermit has to go full Focus(rip their health), but if they don't give up their success rate neck/focus rings the Ulti can still candy them from afar. If it's still possible, maybe they can try to sleep lock the Ulti throughout the match in order to win via dice. But I'd imagine most cases where they go for KD, it'd only give the Ultimate an opening to land a solid cluster bomb that'd mess them up real bad(They also have less defense than Karma, as they're humans). But due to their high success rate of landing all their sleeps, lets say that they're equivalent to Ultimate Majin. Ulti has survivability, while Turtle Hermit has high success rate to keep them locked in place.
Shadow Knight: Finally, the last class I have left to cover. Even if you use pretty much the best strat against Ulti which is to go full focus, and CD in order to spam Taunt debuffs and their other debuffs, generally the Ulti won't lose. Going Full Focus, and CD would only render you defenseless against the Ultimate's absurd damage as seen with Pram vs Skedar.
The only way for SK to defeat Ultimate Majin(with good gear) in DBOG was to use the arm pull KD strat, which Daneos removed from the game. If it weren't for Sendoku abusing the Arm-KD strategy, Skedar would've squashed him with no problems at all. Ultimates are very tanky(virtually unkillable), they resist A LOT(as seen in the Sendoku fight, and from what I've heard about Karma vs Ultis), and without KD, SK can't do anything against Ulti aside from use lp% and hope that they don't need to use senzu until last second.
Thus in conclusion, the only class in the entire game with any real form of advantage against Ulti is Crane Hermit. Dark Warrior, Turtle Hermit, Grand Chef, Poko, and Dende are capable of just about fighting "evenly" against Ulti. While Ulti is beatable by Karma, generally they have a concrete advantage over them in a fight, and Plasma Majins/MAs don't stand an inch of a chance.
Just an extra note, but aside from Crane(whose attacks bypass phy/eng defense) that struggles heavily to kill Ulti, none of the other classes even come close to killing Ultimate Majin. Unkillable + no concrete counter; The only way to win is by dice or KDing them out if you can(Which you won't accomplish most of the time).