A third storyline could be a sports - related one. They all join a basketball team. Takemichi is the underdog trying to prove himself, Mikey has natural talent but is a bit of a wild card, and Draken is the reliable team captain. They face off against tough opponents, and there are internal team conflicts as well. But in the end, they learn to work together and become a great team.
To write a compelling character interaction, start with understanding their personalities. Takemichi is often determined but a bit clumsy at times. Mikey is strong - willed and has a natural leadership quality, and Draken is the loyal and protective type. So, when writing their interactions, you can show how Takemichi's clumsiness might make Mikey laugh or roll his eyes, while Draken would be there to support Takemichi. For example, if they are in a fight, Takemichi might accidentally trip over his own feet, Mikey would be like 'Seriously, Takemichi?' and Draken would quickly pull Takemichi back to safety.
Sure is. ET features a story centered around an alien visitor, which is a staple of science fiction. The movie also incorporates elements of fantasy and adventure within a sci-fi framework.