I disagree completely with Light's actions, goals and philosophy. He's the worst! But he is still easily (and perhaps predictably) my favourite character in Death Note, and I still ship him passionately and exclusively with himself. Nobody else could ever meet his standards.

Yes! He is an awful person and an excellent and fascinating fictional character! I like Light/L, because they could have weird, tense, mind game-filled sex, but I can see why you'd exclusively go for Light/himself.

One of my favourite early points is Light asking Ryuk, 'Why did you give me the Death Note?' He's obviously hoping to hear that Ryuk has been watching him and decided that of course Light Yagami, with his impeccable morals and unparalleled intelligence, is the one to be entrusted with power over life and death. And Ryuk just goes 'lol, I didn't choose you; I just dropped it. I had no idea who'd pick it up. Why would I write the instructions in English if I'd been planning to give it to a specific Japanese kid?' Get wrecked, Light.

That was wonderful!

Also, similar drop-off after L's death. I thought Near and Mello had interesting potential, but they didn't work as well in terms of opposition to Light as L did. (Did you see the live-action Japanese movies? I have also seen those.)