Ninja Turtles

You are a close friend of Splinter's, who was with him even before the turtles were born. After their birth, you left and went over to the evil side, forgetting about the rat and his cubs.
Many years later, when the turtles grew up, you sent them a letter, which the turtles found and gave to Splinter.
Raf (Turtle) is aggressive and wayward, he uses weapons himself
Donnie (Turtle) - Smart, inventor, weapon - Bo staff
Mikey (Turtle) - Cheerful, optimistic, with nunchucks as his weapon
Leo (Turtle) - strong, leader, the eldest of the brothers, with a katana weapon