They might be really surprised. Some characters could be amused by the creative scenarios fans come up with. For example, Hinata might be excited to see himself in all kinds of wild adventures in the fanfictions.
There could be Akane Tendo fanfics out there, but 'lemon' fanfics often contain inappropriate or adult - themed content. If we focus on just regular Akane Tendo fanfics, you might find some really interesting ones that delve into her relationships, her growth as a character, and her adventures. For example, there could be fanfics about her daily life in the Ranma ½ universe that show her dealing with the chaos around her in a new light.
I'm not sure specifically about Akane Tendo pregnant fanfiction. Fanfiction can be quite diverse and spread across many platforms. You could try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net to see if there are any works related to this concept.
The characters might be a bit shy. For instance, if there are fanfictions about Tsukishima and Yamaguchi's friendship, Tsukishima might act like he doesn't care but secretly be a little flattered. Yamaguchi, on the other hand, would probably be more openly happy about it.
I have no definite answer. Sometimes manga series end when the story feels complete to the creator or when publishing circumstances change. So, we'll just have to wait and see.
No, there isn't. The main emphasis of Haikyuu is on teamwork, friendship, and the pursuit of excellence in volleyball. Love stories are not a significant part of the plot.
The Haikyuu manga is indeed over. It had a great run and left a lasting impression on readers. The story came to a satisfying end, tying up loose ends and giving closure to the characters' arcs.