Conventions of a Thriller - Trainspotting

I looked at the opening for the following film - Trainspotting in which we are shown all of the main antagonists. SFX (Text), is used to introduce the characters  e.g. when text is highlights the name of Ewan McGregor's character - 'Renton'. Other characters are given nicknames depending on the attitude or personality. This is enforced using still-shots. The character 'Sick-Boy' is characterised as the 'hardman' of the group by his facial/body expression.

Towards the end of the clip, Renton references heroin, a class A drug, though there is nothing specific about this, connotations go as far to suggest that Renton and other characters are involved in crime/law-breaking - typical convention of a thriller.