I wasn't originally going to make this list, but since I wanted to do a poll on that topic I decided to make this list of the most unsympathetic characters in the series first. Information from Tv Tropes.
Luther is supposed to be sympathetic in the reasoning for his various actions throughout Season 1, but some fans find his stubbornness unsympathetic and his reasoning flawed. While spending years of your life completely alone for absolutely no reason is a pretty horrible thing, these fans tend to sour on him in "The Day that Was", especially considering that he came off a lot better in the last episode (before the timeline changed). In this episode, a drunk and emotionally unstable Luther briefly chokes Klaus and is later too high and drunk to notice when Klaus dies and is soon resurrected. It doesn't help that Five has him outclassed with his 40 years spent alone, and he doesn't share some of Luther's worst traits.
Allison in Season 1 is trying to be a good sister to Viktor after they haven't talked for ten years and is worried when he takes up with a suspicious man. However, some fans find it difficult to sympathize with her following the reveal that she Rumored her daughter, who was two, for having normal childhood tantrums. For a time, it seems she blamed others for the problems this caused rather than taking responsibility. It's also grating that her attempts to build connections with Viktor often come across as simply yelling "I'm your sister!" over and over rather than showing any real sign of understanding or commonality. Blindly relying on sisterhood rings especially hollow given her distinctly non-sisterly relationship with Luther.
In season 1 some fans argue that Viktor's focus on his childhood exclusion makes him come across as whiny and self-absorbed, considering he brings it up at several highly inappropriate moments and becomes passive aggressive when his siblings try to reason with him. He shows no remorse for writing a book that put his siblings' personal demons on full display and most likely did heavy damage to their reputations. His constant cutting remarks toward Allison also make him seem like a bit of a bully, as Allison is, at that point, the only sibling actively trying to befriend him and treat him like part of the family.
Ben towards Klaus at times. While it is fair that he be fed up with Klaus at this point, his frustrations sometimes come up at inappropriate times, such as him telling Klaus that 'the real torture' was watching him throw his life while Klaus is being tortured by assassins and suffers from the traumas from his past. And while he does have a point about Klaus trying to talk to Dave, he never seems to sympathize after it ends in Klaus getting punched by the love of his life out of homophobia and it only annoyed by Klaus' coping mechanism, which was breaking sobriety. Then there's Ben breaking the rules Klaus set for when he's possessed, which has... implications.
Allison during season 3. She's far from the only character through the series to lose a loved one, yet she spends all of season 3 blaming other people for her loss and acts violently psychotic without comeuppance or acknowledgment of any kind. Among other things, she sexually assaults Luther with her mind-control power, she murders an innocent disabled man purely out of vengeance, and then she gloats to Viktor (whom was a surrogate parental-figure of sorts to the victim) about it whilst torturing him in front of their family. No one in the family seems to catch on to her murderous, psychopathic behaviour, and in fact they give Viktor more grief over the above events via everyone being upset about him trying to save Harlan's life, Five threatening to kill Viktor if he gets out of line, and even Luther pushing Viktor to try to make up with Allison. She appears to get everything she wants by the end, with no acknowledgment of the fact that she's a self-admitted remorseless murderer, sexual assaulter, and would-be rapist.
Lila after the revelation that Stanley isn't actually her and Diego's kid but just the son of a friend whom she took from his own time and dumped onto Diego before running away. While it was according to her a Secret Test of Character, since she is actually pregnant with Diego's child, some still found Lila's behavior cruel and irresponsibly insane since she's essentially still abandoning a child with someone who is a stranger to him. Viewers felt Lila should already know, having got to know and love Diego that he would be a good father and while she may of been raised to be sociopathic by The Hander, that Freudian Excuse for her actions wears thin when it's shown she is capable making good choices and not acting like an overgrown child. Worse still, Stanley gets killed by Kugelblitz which never would've of happened in the first place if she didn't orchestrate this cruel scheme of fooling Diego into thinking he had a son.
What do you think? Do you agree or do you have a different opinion?