Final answer:
Percy Jackson first fully designs a chariot with his half-brother, Tyson, in the book 'The Sea of Monsters'. Their collaboration in building the chariot highlights their bonding and adds to the character development within the series.
Step-by-step explanation:
Percy Jackson, a character from the Percy Jackson & the Olympians series written by Rick Riordan, is known for his adventurous and mythical escapades. In the second book of the series, The Sea of Monsters, Percy teams up with someone special to design a chariot for a race. The correct answer to who Percy first fully designs a chariot with is b) Tyson, his Cyclops half-brother.
The chariot-building episode is significant as it showcases the bonding between Percy and Tyson, and also adds depth to the characters and their relationships within the Camp Half-Blood. They work together to create a chariot that represents their unique skills and the strength of their newfound brotherhood. The teamwork and creativity displayed during the design and building of the chariot are one of the many examples of Percy's resourcefulness and ability to forge alliances even in the most unexpected circumstances.