Ratchet & Clank: Ratchet and Clank's character

Personality:
Ratchet was a street-wise, wrench-swinging guy who always loved to get into an adventure without really thinking about the risks or odds. He made many sarcastic comments or jokes and could take things personally, but over the series of the games, Ratchet seemed more matured and serious. He enjoyed swinging down Zip-lines and using his Swingshot.

Ratchet, like many Lombaxes, was also known to have invented many items, some of which were more successful than others. These items included Stunderwear, amongst many others.

Personality Change:
In the first game, Ratchet was very selfish, arrogant, and self-absorbed and Clank had to talk him into helping other planets. Throughout the course of the game, however, he became more dedicated and serious to stopping Drek's plans. He was described as a practical joker by his best friends, and had an ambition of becoming a space explorer. After that, he became a less selfish person, and a more likeable character. He became very selfless, and at the end of Deadlocked was willing to give up his life for all the captured heroes that he eventually saved.

Clank, real name XJ-0461, was a small robot, programmed with artificial intelligence, and Ratchet's long-time companion and best friend. He was born at the robot plant on the planet Quartu but he was created in the Great Clock. While Clank's serial number was B5429671, the name "Clank" emerged when Ratchet made his handmade ship rock while flying to planet Novalis, causing the small robot to hit the side of the ship and making a clank sound. This became his nickname throughout his adventures with Ratchet. The Zoni referred to Clank as the "Chosen One". Clank's father was a Zoni named Orvus. After meeting Orvus for the first time, Clank became the senior caretaker of the Great Clock

Creation:
Originally, Clank had been part of a production line of sentry-bots at the Robot Plant on planet Quartu, which had sentry-bots that were meant for Drek's assistance. However, due to what was believed to be a mishap but may actually have been the manufacturing robot gaining a conscience, Clank appeared on the conveyor belt as a small, harmless robot, instead of a large, dangerous sentry-bot. Clank watched an Infobot video of Drek's plans to create a new planet using other planetary components, and was then forced to rush off Quartu - sentry-bots had begun chasing him, classifying him as a production error. Clank seized control of a spaceship and took off in space, but was shot down and crashed on the Kyzil Plateau of planet Veldin, where Ratchet found and took him back to his handmade ship. Clank showed Ratchet the infobot video of Chairman Drek and informed him that he wanted to contact Captain Qwark - Clank believed that only the famous captain would be able to stop Drek's menace over the galaxy. Clank proposed to start Ratchet's ship using his latest robotic ignition system, in exchange for a ride to planet Novalis where he would begin tracking down Captain Qwark.