The speech bubbles and characters keep my attention.
Yes, I like to read stories that use speech bubbles. It makes it easier to follow along with the plot.
Yes.  Specially for comics or comic magazines as they call them.
It makes it easier to comprehend dialog without having to name the speakers.
Dutch comics
Dutch comics are comics made in the Netherlands. In Dutch the most common designation for the whole art form is "strip" (short for "stripverhaal" – "strip story" – , though the old-fashioned expression "beeldverhaal" – "picture story" – remains utilized on occasion, particularly in formal texts and treatises on the subject matter), whereas the word "comic" is used for the (usually) soft cover American style comic book format and its derivatives, typically containing translated US
series.
Using clear patterns and lines, the characters would speak using speech bubbles more similar to comics than to picture books. The text and words would not use any difficult kanji or any furigana, instead using lower grade level words so that it can be read alone without needing any help. It also features excessive puns and it is because of this that puns saw a boom in use in elementary school students. In spite of it being called a well read elementary school "children's book", it has an