Genre
'Se7en' is a psychological thriller. Just from the opening credits we can identify the genre due to it conforming common conventions of this type of this type of genre. From the trailer, we can gather that the character has an obsession, as the main focus of the opening credits is of them creating a book/diary over something that they obsess over.
Mise-En-Scene
Throughout the titles, the main focus is on the book that the character creates. We are constantly shown images of them crossing out words from the Bible and of people's eyes. This indicates that the character has either killed someone or is altering/removing words/phrases that he/she does not like. 


We also see the character removing their fingerprints with a razor. This shows that they have or are going to commit a crime. This also shows that the character is mentally ill/disturbed as they are self harming, therefore conforming to common conventions of a psychological thriller.
Also featuring in the opening credits are detailed drawings, which indicate that the character has spent a lot of time creating them to add to their book. This shows obsession, which is a common convention of the genre.
We also regularly see the character writing in the book and we can also see that there are a lot of notes on a lot of the pages, again showing the dedication/obsession that they have for this book.
There are also quick flashes of the Bible in the credits, which relates to the title of the film, 'Se7en', which correlates with the '7 Deadly Sins'. This is what the film is based on, where someone murders people who have committed these sins.


At the end of the titles, we see clips of the character sewing together the book and threading a needle. This looks sinister and like the character has a weapon.
Sound
In the opening credits, there is no diegetic sound, however there is a non-diegetic soundtrack. This starts off slow and sinister with lots of synthetic sounds. At the very beginning, we hear 'thunder clap'. This creates a dark and eerie setting and immediately we can assume that the film will be some sort of horror. As the soundtrack progresses, we hear a synthetic drum sound and some creaking. This again adds to to horror and darkness of the film, making everything sound broken and old. There are also quick sound changes as some sound effects are played unexpectedly and very quickly, also assuring the audience that this is a horror/thriller film. Occasionally we hear synthetic screeching/scratching, making the soundtrack sound sinister and creepy. As we get further through the soundtrack, more and more sounds are heard. This makes the sounds more dramatic and fast paced, creating tension. At the very end of the credits, there is some non-diegetic dialogue which is part of the soundtrack. The voice of the singer is hoarse and croaky, which increases the sinister sounds. At some points in the soundtrack, the quantity of synthetic sounds increases and decreases, which unsettles the audience creating unexpected quiet and loud sections also creating tension. I have also noticed that the soundtrack starts of slow and gradually builds up towards the middle and end of the credits. This is dramatic and creates tension and uncertainty for the film. Overall I believe that the sound for the opening title for 'Se7en' is parallel to the 'Mise-En-Scene' and the genre of the film.
Typography
There are two different styles of text in the opening titles. The first is the text displayed for people's names.This appears to be 'scratchy' and handwritten as if someone has used an ink quill to write it with. It also looks like it could have been carved using a knife or a sharp object, making the text look sinister.
When the title of the film appears, it is much larger than all of the other snippets of text that have previously appeared. This is to make it stand out and become more significant.
When all of the text appears on the screen, it glitches and will move slightly, creating a sinister and unsettling effect. The timings between the text are only small but this is in parallel with the fast paced music. Again this makes it look unsettling and creates adrenaline for the audience.