The following contains major spoilers for Black Panther: Wakanda Forever, and Wakanda #2, available now from Marvel Comics.
It's safe to say Killmonger has become one of Marvel's most iconic characters, mainly due to Michael B. Jordan's stint as the villain in the Marvel Cinematic Universe. The Black Panther comics never really shot him into the limelight as much, despite being King T'Challa's main foe, but the movies certainly did. They painted him as a sympathetic villain who just wanted his birthright in a kingdom marred by turmoil.
It's why fans are now lapping up Killmonger's cameo in Black Panther: Wakanda Forever, enjoying how much he wanted to fight against colonials and the system. Ironically, Killmonger or N'Jadaka, as he's known in the lore, did play a part in Ta'Nehisi Coates' story about the corrupt Wakandan intergalactic empire that rose up outside Earth-616. Now, come Wakanda #2 (by Evan Narcisse, Adam Serwer, Ibraim Roberson, Natacha Bustos, Jordie Bellaire, and VC's Joe Sabino), as M'Baku follows up on that run and watches over this cosmic kingdom, he ends up getting his own version of Killmonger.
Black Panther's Killmonger Has Warped Principles
While the source material's Killmonger was more about greed and power, the MCU's was steeped in principle. He didn't like how T'Challa's dad, T'Chaka, killed his dad, N'Jobu, thus, he sparked a civil war. This led to Killmonger returning home, beating T'Challa, and launching a coup. He even got some council members to his side, making it clear Wakanda was a weapon to be wielded.
In his eyes, bombing elite, entitled nations would make up for centuries of slavery and oppression. Then, Wakanda would be able to truly reach its full potential at last. Sadly, Killmonger didn't care who he had to kill or enslave in the nation to attain this goal, making him just as evil as the folks he preached against. It's why T'Challa eventually killed him, but mourned his cousin because he knew Killmonger just wanted what was best for their people.
Wakanda Gives M'Baku an Antagonist Similar to Black Panther's Killmonger
In Wakanda #2, M'Baku ends up fighting a similar tyrant who wants to take power from him. This turns out to be L'Krah -- someone M'Baku considers a brother after breaking away from their slavery estate. M'Baku hated being an oppressor, and when he left he thought L'Krah, the estate's prince, became altruistic, going against the wicked ways of King L'Krun. Well, after L'Krah failed to escape, his dad inculcated that sense of privilege, making him think the empire's throne belonged to him.
When the regent passed, a bitter L'Krah assembled his own rebels -- the Pride of Ghekre -- and allied with other "vibranium princes." Their mission is now to take over the empire and turn it into a symbol of fear and wealth. It's similar to what the MCU's Killmonger wanted, including the one who fought against M'Baku and T'Challa in this book. Luckily, M'Baku takes his former friend down and imprisons him, but L'Krah already has attacks going on all over. He's destabilizing the empire, warning M'Baku that Wakanda won't achieve greatness under him. Ultimately, L'Krah is becoming that freedom fighter Killmonger claimed to be, promising their personal vendetta will only end with him ruling Planet Bast.