In the manga, Deku stays at UA. His journey is centered around his experiences and development within the institution. There are no plot points where he leaves UA permanently.
Deku remains a part of UA in the manga. His journey and growth are centered around the institution and its associated challenges and opportunities. There's no indication of him leaving.
Well, in this type of fanfic, it may start with Deku and Uraraka realizing their feelings for each other which had been budding during their time at UA. The story could then show how they start to date secretly, trying to balance their hero training and their new relationship. There might be cute moments like them sharing their dreams and fears, and also some tense moments when they face villains together and have to protect each other, which in turn strengthens their bond of love.
You can try searching for it directly on Wattpad. Use the search bar and type in the exact title 'deku and uraraka love after ua wattpad fanfic'. If it's a popular fanfic, it should show up in the search results.
The information on whether the entire army would return after the attack was inconsistent. There were some articles and comments that suggested that the whole army might return, but there were also some articles that said that the possibility of returning was not high. Tianmei officials did not officially announce that the whole army would return or be permanently removed from the shelves. Therefore, it was currently uncertain whether the entire army would return.
Synonyms for returning to the martial arts world were gambling tyrants, Dragon Tiger Sect, Jingwu Sect, washing up in the golden basin, Little Li Flying Dagger, God of Gamblers, Bandit Commander, One-armed Blade, Limp Hero, Roll Earth Again, and Rise Again.
I haven't heard anything definite. Maybe there's a chance, but it could also be that the story has reached a natural conclusion. We'll have to keep an eye out for official announcements.
I'm not sure. It could go either way. Sometimes characters come back in unexpected ways in manga. Maybe there'll be a twist that brings Gojo back into the story.