Resident Evil of Kharlindale Realms, because he's the Grim Reaper that does 100+ damage with Wicked Union scythe + sneak attack damage if Wicked Union stuns(as level 5 weapon master critical damage doubles so 200+ next level, takes rouge class for use magic device skill at 15 and Skill Focus(Use Magic Device) to offset the Charisma penalty to emulate other classes and to use Skin of the Manticore), plus 8 Skin of the Manticore cloaks for free magic missile spike attacks at range, and shield of spell resistance with venomous short sword for evil sword and board and a belt of spell resistance, a rogue helm that makes him immune to poison and knockdown to defeat opposing assassin and black guard prestige class toons as a weapon master prestige class toon that one-hit homeruns with critical hit power attacks as scythe master. He's more assault mech killing machine than anything else D&D-wise, only downside is he levels up slowly because half-orcs are typically stupid barbarians and he's as smart as a wizard. Uses wizard items too, so can use spells.
https://tvtropes.org/pmwiki/pmwiki.php/Main/BigBad
"Nyah." ~ Skeletor
Strength: 17(+1 every level after raising Intelligence to 13 to unlock Weapon Master prestige class)
Dexterity: 14(uses chainmail)
Constitution: 14(rogue class gets 8 HP, standard monster hit points)
Intelligence: 12(+1 at level 4, is 14 with Ring of Clarity)
Wisdom: 10 (no penalty for rogue senses skills and no penalty for Will saves)
Charisma: 6(farts frequently)
Crucial Equipment: Wicked Union(scythe), Skin of the Manticore, Rogue Helm, Gauntlets of Ogre Power, Gloves of Appraisal, items that increase magic resistance to offset XP penalty like Duergar and Drow, invisibility potions and healing potions to go invisible and restore HP back to full health when HP is low, haste potions to increase armor class and double the number of attacks in boss battles, invisibility and haste potions to bypass dangerous areas quickly. Any items that boost rogue skills, start game at Thieve's Den and talk to Silk the drow rogue at the campfire to the Northwest for improved Rogue Gloves, start game as rouge to have thief tools)
Skills: Lore(5), Use magic device(15, for Skin of the Manticore), Appraise(15, with Gloves of Appraisal and Ring of Clarity appraise skill is 20 and you get best prices at stores selling loot and lowest cost buying eventually becoming a zillionare by farming Brandenburg Estate guards in the area directly west of Thieve's den. The secondary skills as Search, Disable Trap and Open Lock to unlock chests for more gold and potions, you will be laying the slaying down in combat so no hide and move silently skills. Instead save skill points to raise Tumble 5 ranks repeatedly for +1 armor class and to evade melee attacks in combat. Sneak damage will be applied when Wicked Union scythe stuns, Exotic Weapon proficiency feat, Power Attack feat and Improved Critical(scythe) are most important. Always activate power attack mode in the quick bar by adding it). At level 18-20 take Cleave feat and Great Cleave fighter feats to prepare for epic Fighter levels at level 21 ready to get free one-hit homerun overkill damage weapon master slayings on mobs of enemies.
They'll want to retreat from melee or die but they'll get manticore cloaks galore and die differently. And they will die one day anyway so reap grimly.
Note: When using manticore spikes you won't have to use melee, switch to shield and short sword to increase armor class versus archers and so that the sword is backup weapon to scythe without being too heavy, Fighter/Rogue because there is a venomous short sword. That way you're a Blackguard/Assassin/Weapon Master too. High strength means lugging more loot to sell to merchants, is the most profitable build. Sell what you're not going to use at merchant after you run out of carrying capacity and minimize your carry weight, do not pick up heavy armor or wear heavy armor because the weight to cost ratio isn't as optimal as magic weapons of lower weight so be a weapon master that sells light/medium armor and weapons as well as magic items. Once your Disable Traps and Unlock skills are 8, raise Parry to 8 and Craft Weapon to 8 to use your massive gold stash to modify scythe.
In closing, why Neutral Evil? No penalty against items that affect Lawful/Chaotic, Rouge Helm makes toon immune to Knockdown and poison used by Blackguard, is Evil so it thwarts Blackguard Smite Good, Assassin is another evil prestige class that utilizes poison that won't work. Therefore, Neutral Evil Rogue/Fighter/Weapon Master rules the evil nest as gang leader of an evil party. Think of it as an anti-hero doing whatever the hell he wants as a mercenary, what would Deadpool do?