6. Onslaught
First appearance: Uncanny X-Men #322 (1995) (previously hinted at in other forms)
Who is Onslaught? Onslaught is another personality of Charles Xavier, also known as Professor X. During a battle, Charles absorbed Magneto’s negative emotions. Through a tragic event, Onslaught awakened within him, originally intending to bring peace for the mutants. Regardless of the cost.
Initially, he wanted to wage war against humans with the mutants, but when Charles was freed, Onslaught only became stronger. He is convinced that nobody has the right to live, which is why he wants to destroy everything and everyone (via Marvel.com).
What abilities does Onslaught have?
- He can assume an astral form
- He possesses the abilities of Charles Xavier and Magneto
- Telepathy
- Mind control
- He can take over bodies
- Telekinesis
- In his physical form, he has an almost indestructible armor
- He can absorb mutants and take on their abilities
- With the powers of Franklin Richard, he could create a second sun (via Marvel Database)
7. Dr. Doom
First appearance: Fantastic Four #5 (1962)
Who is Dr. Doom? Driven by his hatred and his desire for power, Victor von Doom is a dangerous villain. He is not only a technological genius but also well-versed in magic. As the ruler of Latveria, he also holds diplomatic power.
Although he is usually a normal human, he has fought against cosmic beings like Thanos multiple times and easily defeated them. He regularly acquires powerful abilities with which he also threatens the multiverse (via Marvel.com).
What abilities does Dr. Doom have?
- He can use magic, like Dr. Strange
- He is skilled in combat
- His will makes him immune to mind control
- Diplomatic power and immunity
- Charisma
- Large arsenal of weapons and technology
- Great intellect (via Marvel Database)
More about Dr. Doom can be found here: 5 reasons why Dr. Doom is scarier than Thanos in Marvel
Actually, Kang the Conqueror was supposed to be the big new villain in the MCU. But after the actor, Jonathan Majors, got involved in scandals, the villain became quiet. To find out who the next big villain is, we will probably have to wait for the next films. A heroine who was even able to defeat Thanos alone is introduced here: A Marvel heroine is even sillier than Deadpool and so strong that she could defeat 3 of the strongest villains

