Under the separation of powers principle, laws can only be made by the people the congress the president the courts

The answer is "The congress"

In this case, the complete sentence would read:  "Under the separation of powers principle, laws can only be made by  the congress"

Here's a quick explanation on this:

The National Congress is a political institution that exercises the Legislative Power. It is composed of the House of Representatives and the Senate (formed by the senators). The main activities of the congressmen are related to the functions of legislation (which are the elaboration of new laws) and the supervision of the other powers.

glass wants to live in a world of super heroes and villains. he have lived all his life trying to be responsible for the creating the origin story of a super hero; he schemed and caused many incidents (many of them fatal) hoping that someday someone with superpowers would show up and save the day.

he knew himself very much. he saw himself as a villain of a real-life super hero story. he was aware of his strengths (more than smart enough for being manipulative and scheming) and weaknesses (having fragile bones and having to rely on his mind to succeed).