Kuma? Even if surviving all that never giving up made him a gigachad, also that L should go to Dragon and the revo army.
Moria is another character I sympathise for (because of how hard he had it): beaten by Kaido, all his crew is killed, tries to recover from that by building an immortal zombie crew in paradise (aka nobody should bother him there), a random rookie comes and destroys his dream (also, the random rookie is the child of the prophecy), he is backstabbed by the WG for being "too weak" and discarded like trash, he luckily manages to escape and preserve his life, 2 years later his crew is scattered, he comes to know Absalom (one of his "commanders") has been captured by BB. He has the guts to go to Beehive and start a ruckus in order to rescue Absalom, "Absalom" welcomes him just for Moria to be sucker stabbed by Shiriu using the df of his former subordinate while "Absalom" is revealed to be Catarina Devon. Tl dr Moria is a walking L and you can't not sympathise for him.
Then there are a ton of secondary characters with ver sad backstories, Pedro too is one of them.