https://www.youtube.com/watch?v=SIxf0PB6tSk

A lot

Stopped watching after #1. The creator of the video has a tenuous grasp on what stealing means.

Namor...oh wait...

Here's the list

1. Hulk from Solomon Grundy... no... just no. Both come from the classic idea of Dr Jekyll/Mr Hyde, but are completely different takes on it


2. Blue Beetle and Beetle... not really seeing it. Very different origins, really the only thing they share is some basic powers and Beetle in the name


3. Plastic Man and Mr. fantastic... Same powers, totally different characters.


4. Doctor Fate and Doctor Strange... I mean kinda, but obviously both companies were going to have a magician. They're quite different in origins/personality/and other things


5. John Constantine and Pete Wisdom... no idea


6. Amazo and Super Adaptoid, not wrong here


7. Green Arrow and Hawkeye, eh kinda, but it's like Plastic Man/Mr. Fantastic, same gimmick, different characters


8. Captain Boomerang and Boomerang, yeah probably


9. Superman and Sentry. Not true at all, that's like saying Plutonian is a rip off of Superman. Superman is the single most iconic comic book character and Sentry is a take on his character.


10. 
    

terrible list

Marvel and DC have an unspoken deal that they can ripoff each other's characters whenever they want and neither will take it to court. For example, Marvel ripped off Green Lantern to make Nova Prime, and DC ripped off Namor to make Aquaman.

It does seem like Marvel tends to do it more often, but DC has still done their fair share, and you know what, that's okay. Some great characters from both companies have come as a result of knocking off the other.

Pretty sure these are

1. Any version of Hyperion


2. Gladiator


3. Blue Marvel


4. Sun God