What if only Yaya was there to befriend BoBoiBoy in the beginning. Watch (or read) as a friendship between the two children grow, and don't worry. Fang will be there too, given time. BoBoiBoy/Yaya friendship. Eventual BoBoiBoy/Yaya/Fang friendship. No romance between the character but there will be slightly romantic moments. A 'What-If' fanfic.

(BoBoiBoy and Big Hero 6 crossover fic) Hiro and Adu Du shared their own experience regarding their robot companion and realized that they have much in common than they thought. Set after Big Hero 6 and between BoBoiBoy Season 3 Episode 9 and Episode 10 so SPOILER FOR BOTH BIG HERO 6 AND BOBOIBOY!

Tsuna ended up in a parallel world far disconnected from his own and his body de-aged to a ten-year-old. He meets new friends, BoBoiBoy, Ying, Yaya and Gopal and lived happily in this new world. But when an alien comes to conquer Earth for cocoa, Tsuna and his new friends must defend this world. Takes place after Reborn Manga and follows BoBoiBoy Season 1.

Ying was selected to tutor Fang for the next exam. However, she experienced a certain trouble whilst tutoring him and he noticed it. Fang/Ying one-shot. Warning, contain romantic elements even though not the main thing in the story, rated T just in case.