Luke's posture vaguely mirrored L's own, and subconsciously, this made him a little more likable in the detective's judgmental eyes. L could be egotistical, but he was blindingly aware of his own imperfections, and something about knowing that LUKE SKYWALKER did some of the same things he did was oddly comforting. "Are you sure you aren't just trying to distract yourself from your own troubles?" L asked. "I'm sure you're kind, anyway, but... going out in the cold to deliver your shower curtains and only blankets to a stranger seems a little extreme. Even though we talked over journals, I could have been lying when I told you that I'm not the most impressive individual, essentially. I could have been bigger than my bodyguard, with violent intentions toward you. Pity is often exploited for the gain of the impure, sadly."
L did this often. He noticed opportunities to do bad things disturbingly often, and reflected on them throughout the day. I could have poisoned that cup of coffee. I could have killed that man while he was picking up his dropped hat. I could have stolen that purse while that woman was calming her baby. Maybe he was the only one who thought this way, and maybe not, but he rationalized it all. As long as he didn't act on these things, he figured, he was still a good person. In deeds, at the very least, and that was all most people cared about. "In your world, heroes are destined, so... one could argue that you always have been," L said, with a shrug of one skinny shoulder.
"Oh, I'd believe it," L said, thinking about the abuse his compulsively-nibbled fingertip had taken during Return of the Jedi. It had bled for hours even after the credits had rolled, just thanks to that metal bikini. And Luke didn't even know about that! L thought. Maybe better that he didn't. "She's a very beautiful woman. And she would be older than you... you know that you're twins, I'm sure, though that's not the case here. That's really odd, isn't it?" Now, that sounded dumb... what about this world wasn't odd?
"It's good that you're getting along. That's consistent with your story. So... life on Tatooine. What's it like?" L was secretly disappointed that the things he really wanted to ask about, like how it felt to be electrocuted by the Emperor, couldn't be answered by this version of his favorite Star Wars character.