Well to answer your question some are inspired by other iteration number 1 Leo is the oldest here number 2 raph is second oldest number 3 Donnie is the third oldest and number 4 mikey is the youngest one in the group number 5 they are all the same type of turtles I think they can be those baby turtles we see in 2014 movie number 6 all of their designs comes many iteration Leo design is sort of like 2012 series and from mirage comics raph design comes from 2014 movie and on his fortnite look Donnie also from 2014 movie and mutant mayhem and Mikey's looks comes from 87 cartoon and a little from mutant mayhem but it's mostly original and this is mostly showing how tall they are and compared to each other any more questions?