The Fifth Doctor was played by Peter Davison from 1981-1984.
Five was much more passive and reserved than his previous regenerations. He tended towards non-violence and tended to be very indecisive. However, there was something exceedingly human about Five, which was something that David Tennant later claimed as inspiration for his portrayal of The Doctor.
Five had the curious habit of wearing a stalk of celery on his lapel and had the least difficult-to-draw hair since the Second Doctor.