These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
From the prequel, Auletes Ptolemy is a perverted, Ax-CrazyBlood Knight who is introduced admitting that he's going to enjoy slaughtering a British town and plans to rape the native women after the battle is won. He is never presented as heroic and even his fellow Egyptians seem to be disgusted by him. The Gaelic general Vortigern counts as well.
HSQ: The Timurids bring nine thousand troops into Scotland, totally dwarfing any army that could be assembled against them. Except the fifteen thousand Scots waiting for them.
Magnificent Bastard: Aodh Canmore, full stop. Pick one of his plots, any of his plots. From destroying the Moors while Domnall is incapacitated to convincing Domnall to attack the Danes to convincing Hungary to invade and sack Rome and then retaking Rome and talking the Pope into surrendering control over all the Papal lands to Scotland to the entire false Downer Ending that leads to the simultaneous assassination of the entire Timurid leadership, Aodh Canmore is someone you do not want to try to out-fox.
Fearghus Campbell and his successors in the Scottish Spy Network also serve as these. Even after two full generations of new Spymasters have replaced him, people all over the world still get the creeps when his name is mentioned.