fedor - because of his demeanor
sakuraba - because of how entertaining he was and his skill set
imanari - because of his crazy good submissions and his odd personality
the first fight i think i remember hearing about was frye-shamrock. my older brother told me about it, and then i saw some old replays of royce and ken, and then the tuf show appeared on spike. all of these things helped me become an mma fan, but watching fedor and saku fight are what got me hooked. from there i went and watched as many older events as possible