Another theme could be teaching or mentorship. Just as the big sister taught her younger sister to paint. Big sisters can pass on their knowledge and skills to their younger siblings, which is a very positive theme in these kinds of stories.
One possible theme could be friendship. Since it involves a big sister and a game, they might develop a deeper friendship - like bond through the play. Another theme could be adventure, if the game is about exploring or going on quests.
One possible theme could be good vs. evil. Since it has 'big bad' in the title, there might be a clear distinction between a 'bad' force or character and those who oppose it.
One possible theme could be acceptance. Skylar Vox might have to accept her new step - sister into her life and family. Another theme could be jealousy. There could be moments where either Skylar or her step - sister feel jealous of the attention the other gets.
Growth and learning could also be a theme. Big daddy, being older and more experienced, could teach little sister important life lessons, and as little sister grows up, she might also influence big daddy in some ways, leading to both of their growth.
One possible theme could be sisterly love. The act of singing for the sister shows a deep connection and care. Another theme might be transition. The sister is being'sung down', which could imply she is going through some kind of change like growing up or facing a difficult life event.
Another theme might be self - discovery. As the character embarks on this trip, they may learn more about themselves. For example, they could discover their inner strength or their true desires during the journey. The journey to 'up yonder' can act as a catalyst for this self - exploration. Also, the theme of change could be present. The trip could cause a significant transformation in the character's life, whether it's in their beliefs, relationships, or their overall perspective.
Love and protection. Big sisters usually take care of their little sisters, like protecting them from harm.
One possible theme could be discovery. Since it's about a big box, there's likely something to be found inside, like new opportunities or hidden treasures.
One possible theme could be size. Since it's a big pig, the story might explore how being big affects the pig's life, like it might face difficulties in moving around or might be intimidating to others.
One possible theme could be family. Indian culture places a great emphasis on family values, so the story might revolve around family relationships, like loyalty, sacrifice, or family disputes.