Pre-internet (and pre-satellite TV for me) era so it was mostly people off terrestrial TV and stuff like that:
Neighbours:
Nicola Charles (Sarah)
Kimberley Davies (Annalise. Bit cliched though, classic sort of ditzy blonde that would appeal to a 13 year old)
Natalie Imbruglia (Beth)
Mellissa Bell (Lucy, I think technically this was a pre-teen crush, looking back now I'm not sure why)
Hollyoaks
Shebah Ronay (Natasha. Very underrated this one, sadly kind of dropped off the face of the earth afterwards)
Davinia Taylor (Jude)
Mechanic off of Knightrider
Wilma off Buck Rogers
Samantha Janus (Game On)
Jet and Zodiac off Gladiators
Phillipa Forrester. Unlike most of the above I still found myself drawn to her well into my 20s.
Jennifer Aniston. I thought she was a bit different at the time, I didn't realise that everyone else fancied her as well
Anna Kournikova
Baywatch obvs