I played a CG Ranger that way once. Fanatics can be fun. It's really really hard to argue with someone who views everything in black and white.I've played a paladin as a dangerous fanatic who had no mercy for any evil. It was a lot of fun. Even better was the party members being unable to refute my paladins arguments for wanting to slay all evil without mercy.
I've gotten the chance to play that paladin before. The one who inspires his hard-hearted CN fighter friend to try to make the world a better place--because my paladin showed that that is what true strength is. The one who earns the mutual trust and respect of his grabby-hands thief friend, such that he's comfortable with her doing some rules-bending because he trusts her judgment, and she in turn knows that if he DOES raise a concern, she needs to take it seriously. The one whose passing leaves the world a better, brighter, nobler place than it had been before.Great paladins are more concerned with justice and charity than with meting out punishments and preaching about other people's moral failings. [...] One appropriate way to achieve that effect is to be consistently honest and unselfish, and to place the welfare and safety of others before your own.
[...] some of the party scout's actions are likely to earn your disapproval. When they do, don't nag or become self-righteous. Instead, register your dissatisfaction without rancor and keep an eye on the scout in the future. If you've done a good job of making your paladin admirable, your quiet displeasure should prove most compelling.
I have no idea what any of that is (except Aasimar, but have no idea what a Lumin Aasimar is).Paladins are the best class! If you haven't played a Lumin Aasimar elite class Inspired Paladin with the Watcher Agent background, a couatl familiar mount, the Vessel of Life, Vessel of Light, and Sacred Flame Adept feats, and the full Eight Treasures item suite comprising Vigilance, the Pearl Plate, the Ruby Gauntlets, the Sapphire Helm, the Amber Bracers, the Emerald Epaulettes, the Topaz Greaves, and the Amethyst Gorget, you don't know what you're missing.
Somewhere between homebrew and stuff I might put on DMsGuild: new aasimar subrace and racial feats, elite class (think paladin/battlemaster fighter gestalt), the couatl familiar mount and magic items feature in a paladin solo adventure I'm working on.I have no idea what any of that is (except Aasimar, but have no idea what a Lumin Aasimar is).

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.