One idea could be exploring the backstories of the characters more in - depth. For example, fleshing out how Alex became so good at gaming before the alien invasion. Another could be creating an alternate ending where the group doesn't succeed in saving the world right away, but has to embark on a second, more dangerous mission.
I'm not sure specifically which 'rim jhim rim jhim 1942 love story' you are referring to. There could be a movie, a book or a local tale with such a name. Maybe it's a love story set in 1942 with some elements related to the sound 'rim jhim' which could be rain or some other rhythmic sound that plays an important part in the story.
Another theme could be perseverance. If the story is set during a difficult time like 1942, the lovers may have to persevere through various challenges. The 'rim jhim' sound, perhaps of rain, could represent the constant presence of difficulties, but still, they hold on to their love. It could also be a theme of hope, as the 'rim jhim' might also signify new beginnings and the hope that their love will survive.
First, re - watch the movie to get a fresh feel for the characters, the setting, and the overall plot. Then, pick a starting point. It could be right after the movie ends, or you could go back to a key moment in the movie and rewrite it from a different perspective. For example, start from when they first see the alien ship.
Definitely not. Pacific Rim has no connection to manga. It was conceived and brought to life specifically as a cinematic production with its own distinct storyline and universe.
The 'Pacific Rim Story' could potentially revolve around the unique ecosystems found along the Pacific Rim. It could tell of the diverse marine life, from the colorful coral reefs to the large whales that inhabit those waters. It may also include stories of the indigenous peoples who have lived in harmony with this environment for centuries, their traditions and their relationship with the land and sea. Additionally, it could cover modern-day issues like conservation efforts and the impact of climate change on the Pacific Rim.