One possible plot idea could be Alex and Zuba going on an adventure in the wilds of Madagascar. They could encounter various other animals and have to work together to overcome challenges, like finding food during a dry season. Another idea is that they could be separated from their group and have to find their way back while strengthening their father - son bond along the way.
To develop Alex's character better, you could focus on his struggle between his upbringing in the zoo and his roots in Madagascar. Show how he tries to adapt Zuba's teachings to his own modern - influenced ways. For Zuba, emphasize his wisdom from years of living in the wild and his hopes for Alex to become a true king of the jungle.
I'm not sure which 'Zuba' you specifically refer to. There could be many things named Zuba, like a place, a character in a local story, or a brand. Without more context, it's difficult to tell the full story.
Madagascar is purely fictional. The story and characters were invented by the creators to provide an enjoyable and imaginative adventure for the audience. There's no real-life basis for it.
According to the research of modern scientists, the formation of the colorful sand dunes in mauritius was mainly due to the uneven cooling speed of the volcanic rocks after melting. In addition, the crystals contained in the soil and the various metal components in the volcanic ash showed strange colors such as yellow, red, purple, red, and orange after being exposed to sunlight. These colored sand dunes were formed after volcanic activity, but why the colored sand didn't mix with each other was still an unsolved mystery. The color of the sand dunes would change according to the temperature. The color of the sand dunes was formed by the melting and condensation of metal and sand caused by volcanic eruptions.
A possible fanfiction could be set in a time when the group is facing some sort of danger while Gloria is pregnant. The story could show how her pregnancy doesn't stop her from being brave and helping the group. In fact, her motherly instincts could be what drives her to protect everyone, even in a difficult situation.
Friendship is a common theme. Just like in the original movies, OCs in fanfiction often form strong bonds with the existing characters. For example, an OC might help Alex when he's feeling homesick for the zoo.