My favorite Yellow Rangere of all time would have to be Kira. She was sweet, caring, a good fighter, but also incredibly cool.
Second would be Z, then Trini, Ashley, Katie, Taylor, and Aisha.

Re: Who's your favorite Yellow Ranger?
 

Top 5 yellow rangers
Kira
Kelsey
Z
Aisha
Ashley

Re: Who's your favorite Yellow Ranger?
 

I pick Trini, because she was graceful as the first Yellow Power Ranger. ;)