I've only gotten to ep 8 or 9? But I really liked Watari! I didn't like start to hate him or anything but him in his lil secretive outfit had the mysterious villian vibe and now he's like wholesome grandpa.

That is extremely valid. I'm not a big kin myself but I actually really like L because the whole "mysterious detective is actually a trashy rat looking teenage who needs sleep" trope they got going on.