Obviously there are the obvious, Tom Cruise, Sandra Bullock, Denzel Washington, Sam L Jackson, Julia Roberts, Brad Pitt, Bruce Willis.
But for me I would go with Tom Hanks for many reasons I cannot begin to name, but a few will be back to back best actor Oscars, mostly great movie every year of the 90s.
Tom Hanks was to 90s movies as Mariah Carey was to 90s music.