Lucifer from a Satan Is Good perspective. Specially if God Is Good as well. Note that this perspective is actually from Paradise Lost. While there is indeed the word "Lucifer" in Isaiah 14:12–15 of the King James Bible translation, it means "morning star" and it addresses to the king of Babylon (presumably Nebuchadnezzar II). Satan in the canonical account is internationally a Hate Sink for being Always Chaotic Evil.
Isaac. His own father almost killed him. Later, his wife Rebecca and son Jacob conspire against him to trick him into giving Jacob the blessing.
Hagar becomes Abraham's concubine with his wife Sarah's consent and bears him a much-desired son, Ishmael. Later, once Sarah herself conceives and gives birth to Isaac, she has Abraham evict Hagar and Ishmael, who have to wander around in the wilderness before God intervenes.
Joseph. Lived a destructive relationship with his father and brothers, sold by his brothers to slavery, then wrongly accused of adultery, imprisoned and almost forgotten. It takes a while before he earns his happy ending.
Moses: He was forced to flee his homeland and came back to destroy it, abandoned his family to serve God, roamed around with the Isrealies for 40 years and finally died without making it to The Promised Land.
Job had a good life overall, but there was a time when he lost everything, and then things went From Bad to Worse — he lost his children in a freak disaster. Then, his wife had only bad advice for him. And as if that weren't bad enough, his closest friends believed suffering to be karmic in nature, leaving him bewildered and wondering what he'd done to deserve all this. And it was all a test of character, which he passed, and his fortunes were restored. He must have been able to patch things up with his wife, too, because they had ten more children. Even Worse, this was a bet between God and Satan, to see if Job was genuinely righteous, or only because of all the stuff God had given him.
The Blessed Virgin Mary is sometimes this to Catholics. While they believe that She is very powerful and strong, having even Satan himself fear her, you can't possibly read about Her apparitions at Fatima without crying and wanting to spread devotion towards Her so that She may be loved. And then we find out that very few people actually listened to Her, thereby hindering her chances at having more children and bestowing graces upon them. She also had to watch her son die a painful and humiliating death for something he was innocent of. She also grew up in poverty.
Jesus's path to the cross included a kangaroo court, beatings and insults, scourging with a whip, a crown of thorns pressed into his scalp... and that was prior to the cross, the details of which you can easily find elsewhere if you're not squeamish. And on top of that the unimaginable non-physical pain of his first and only separation from God the Father and the bearing of the penalty for every single sin ever committed by humanity, past, present, and future. He suffered three kangaroo courts, one of them simply to mock him, and then further his punishment. Especially since The Bible presents him as knowing exactly what was going to happen. It's easy to think 'He's God, he could take it, right? He knew it all in advance, probably wasn't even afraid!" But then you consider that in the Garden of Gethsemane he was sweating blood and desperately praying to his father, asking if there was any other possible way, that he would take anything else if he didn't have to die like this...and his father said No. So he said "not my will, but your's be done" and went off to die, completely abandoned; "My God, My God, why have you forsaken me?"
The first Nephi of The Book of Mormon. Chosen by God to retrieve the brass plates, his older cynical brothers, Laman and Lemuel several times berate him. After he does retrieve said plates, he sees a vision of the coming of Jesus, and the fall of his nation. When all is well and done, his father dies, leaving him to be the leader of his family. Obviously, because of their jaded views of their second younger brother, they try to kill him, forcing him to relocate and eventually have to face his brothers and his descendants.
Orpheus is the premier Woobie of Greek mythology (if not in fiction in general). If he expressed such sadness after his wife's death that even Hades wept for him.
Hephaestus needs a hug. Stable, hard-working guy who's horribly ugly, born crippled, kicked out of Mount Olympus, possibly by his own mother, married to the goddess of beauty who never cared about him.
Played straight in God of War 3. Even Kratos was disgusted by the Olympians' treatment of him and his "daughter."
Medea has a bit of this going on. She was a princess of a foreign country, and when Jason arrived to get the Golden Fleece, she fell in love with him and used her magic powers to help him accomplish his quest on the condition that he'd marry her. They wound up fleeing the country to escape her father's anger, and in a lot of stories Medea had to kill her brother to distract the king long enough for them to get away. Okay, all well and good. But fast-forward a few years, and now she's a foreigner alone in xenophobic Greece aside from her husband and two children, estranged from her family and friends, and her husband has just announced that he's leaving her to marry the (younger, prettier) princess of Corinth for political gain and oh, by the way, she's going to have to be exiled from the country now but Jason is totally going to try to let her come back to be his mistress. Medea was not pleased at all and poisoned the princess before fleeing the country... so the Corinthians killed her kids.
Some versions of Medusa are this in a nutshell. When you're punished by being made a gorgon because Poseidon couldn't keep it in his pants and raped you in the temple of Athena, let's just say you definitely deserve a hug, even if the hugger is likely to get poisoned or turned to stone for his or her trouble.
Let's not forget Ariadne. Some versions have Dionysus force Theseus to abandon her, while others claim he did it willingly. But either way, poor girl! On the other hand, her sister Phaedra had it maybe even worse...
And oh yeah, there's also Hercules. While we can understand that Hera hated Zeus's infidelity and Hercules had his own anger issues, it was really terrible how she persecuted Hercules like that. It's not like he could help that he was her husband's illegitimate son...
Another good contender and also a bastard child of Zeus is Dionysus. His mother burnt to death while pregnant with him because Hera tricked her into asking to see Zeus' true form, to start with. Then after his second birth, his father hid him at relatives of his mother's, who tried to throw Hera's scent off by passing him as a girl, which went well... for all of three years, when Hera drove them insane, made them kill their own son, and when they got to their senses, they killed themselves in despair, all the while Dionysus watched, only narrowly saved by his father turning him into a goat. Next he was sent to Mount Nysa, had some friends among the satyrs and nymphs, till one day a satyr died when trying to get him a new plant, which after his death Dionysus promptly made the first grape. Then when he tried to spread his knowledge, the king of the first place they went to killed many of his followers and almost killed Dionysus himself. After this Dionysus changed his tune from "let me teach you about wine" to "I WILL teach you about wine or I will make you insane or turn you into whatever I feel like right now. Your pick."
Osiris from Egyptian Mythology. The poor guy was tricked and murdered by his brother, and later had his corpse torn apart by him too.