Ah, definitely cats.
It is a well known fact that cats have significant amount of Aspie traits. They like to be independent and free and never let go of what they really love. They tend to get attached to certain objects and stuff, are quite clever, don't really like changes in their routine, are pretty unpredictable when it comes to behaviour. It's quite amazing, really.
I can "read" them much easier than people and this fact always puts a nice little smile on my face whenever I remember it.
I also love their furs, their looks in general and their lovely silence. I just love 'em, man.
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"Shirahoshi: "But if you're a pirate, Luffy... Then aren't you a bad person?"
Luffy: "... Hm? ... Mmmm... I dunno, that's up to you to decide."
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Moo approves!