Thriller is a type of genre in which can climax to a gory or a horrific scene and can also be left in suspense to leave the audiences on the edge. In thrillers you can always tell who is going to die and who the survivors, a typical hero is usually in a form of a hard man like a police officer, friend, family, boyfriend and much more. "These types of films are known to promote intense excitement, suspense, a high level of anticipation, ultra-heightened expectation, uncertainty, anxiety, and nerve-wracking tension. Thriller and suspense films are virtually synonymous (An example of synonyms is the words car and automobile. Similarly, if we talk about a long time or an extended time, long and extended become synonyms. In the figurative sense, two words are often said to be synonymous if they have the same connotation) and interchangeable categorizations, with similar characteristics and features. Thrillers are often hybrids - there are suspense-thrillers, action- or adventure- thrillers, sci-fi thrillers (such as Alien (1979), crimecaper thrillers (such as The French Connection (1971), western-thrillers (such as High Noon (1952), film-noir thrillers (such as Double Indemnity (1944), even romantic comedy-thrillers (such as Safety Last (1923). "(http://www.filmsite.org/thrillerfilms.html)
Characters in thrillers are many types like criminals, stalkers, terrorist, and someone who an innocent victim out to seek revenge upon the person and all his/her friends. Here are the top 5 according to IMDB:
The Godfather (1972)
The Godfather: Part II (1974)
Rear Window (1954)
Raiders of the Lost Ark (1981)
No Country for Old Men (2007)