I love when readers find some cryptic allusion I made, or influences I have.
I even had readers pointing out things I did not realize, but were clearly true.
I know some people are more annoyed by that, but I'm not, I love it, probably because I have so diverse influences, and it's always so vague and general, that I don't worry about the 'involuntary plagiarism' side of the issue.I like constructive criticism. Even if it's harsh, as long as there are no hidden motives behind it.
I like any comment that shows the readers understand what I'm trying to do, but I also like comments giving different interpretations of what's going on! So I'd say that to this point, I like every comment I received. I don't remember ever getting any comment that made me feel uncomfortable.
The ones I like the less are super generic ones that may be copy-pasted. I don't mind them because it's rare.
I love reading most of them, they kinda show me how each person is experiencing the comic and I think that's the coolest thing <3
I think my faves would be whenever a person picks up some detail in the story, or makes up some kind of theory (it hasn't come to that point yet but I'm sure it will >:D). Anything that shows that the person is really engaged in the comic means the world to be, basically.
I love getting comments specifically about the story. I rarely have interaction on here that's not comic or writing-related one way or another, but it does happen. I like hearing my reader's theories about the story, and what they like about it. Even their confusion, if it's something I can help explain. I like constructive criticism too, like 'hey this aspect needs some work, but you really have this other one going for you', it's encouraging because you know that though you have room to improve, you aren't a completely terrible artist/writer.
Depends on the type of feedback/context. Regarding regular comments and such on my actual pages/comment sections, the type that I love the most are those that speculate what will happen next! Although posting 1-2 pages a week can definitely be a weakness (especially regarding the slooooow overall pace that the story moves as a result), some of my favorite interactions with my readers were scenes that had a few pages of build up to them, so on each one people would give their interpretation of where the build up was going. A few times even discussion among the readers themselves happend which is super neat~
When initially reading the title I thought this thread was more so about critical feedback specifically, and on that side of things I prefer when people don't hold punches and are constructive. When asking for feedback on how my writing or drawing is going, I don't want something sugar coated- I need a little grit to chew on and improve! Granted it's no good if the person is a jerk about it, but most people offering this type of feedback seem to fall in the other two categories- either too sweet/sugary, or just right and with some kick-ass advice~
I love when people comment their thoughts and frustrations towards a character's actions. As a novelist, I'm also very fond of people pointing out typos.
I like when people point out how I've characterized characters, or just how I've written/crafted my story. It lets me know I'm doing a good job and to keep on doing what I've been doing.
Particularly when they go into analyzing aspects of my story it makes me feel like I've created something worth analyzing. 
I like any response that reminds me that a real person wrote it. Doesnt matter if it's a critique, complaint, or personal anecdote. As long as it's a personal interaction, it makes me happy that my art helps drive that connection.
I like when people ask questions. It tells me that they actually read my writing, and it also tells me that they are interested in knowing more about it.
I think I like it best when commenters interact with each other and theorize, about the characters or about what I as the author might do next. Even if their ideas are way off the mark, it's just nice to see that someone can hold an opinion about my work AND care enough to share it with another person.
This. Really any sort of comment that isn't straight up rude is good for me. Deep questions.. simple one word replies. The whole spectrum is good. 
I also love comments on the story itself like what people think of what just happened or what might happen. The same with characters. It's just so fun to see readers going 'I want to hug this character! He's so precious!', then turn around and come up with methods of torture for somebody else
I love love love when a reader can comment on something that needs a full understanding of my universe.
Imagen that the hard work actually is understood by someone!
My favorite type of feedback is honestly anything that can instigate a conversation or necessitate a response. Obviously I like and appreciate when someone says, "I love your comic!" But it doesn't leave much for me to respond to, aside from, "Thanks I'm glad you like it." Anything that provokes conversation is stellar in my book, because it gives me something to respond to.
