My favourite is Bertrand Russell, because he bucked the trend of philosophy being incomprehensible abstract nonsense, but actually used it to help society. He went to prison for being a conscientious objector, was a vocal proponent of nuclear disarmament, feminism, sexual freedom, workers' rights, world government, love for one another, and is one of the wisest people I think have ever existed.
A couple other favourites are Marcus Aurelius and Epictetus, because they are superb examples of living their philosophy and trying to lead a virtuous life. Aurelius was literally the ruler of the known world, could have almost anything he wanted, yet was devoted to living a life of virtue and temperance. He was in my opinion one of the best rulers the world has ever had.
Epictetus was also a Stoic like Aurelius, but was a slave. He had his leg broken by his slave master and used a cane for the rest of his life, and no doubt suffered a lot of hardship, yet is still remembered today for his teachings and ability to make the best of his circumstances.
Then there are a couple of philosophers who I don't necessarily agree with or think are nice people, but I find nevertheless very interesting, who are Diogenes (of Sinope) and Schopenhauer. I love their pithy remarks and DGAF attitude but they weren't exactly great role models. Diogenes apparently used to masturbate in public and Schopenhauer pushed his servant down the stairs. But they were interesting characters with a lot to say.