<Tr> <Td_colspan="2"> Criminal Minds character </Td> </Tr> <Tr> <Th> First appearance </Th> <Td> "X" 10x01, October 1, 2014 </Td> </Tr> <Tr> <Th> Last appearance </Th> <Td> "The Hunt" 10x23, May 6, 2015 </Td> </Tr> <Tr> <Th> Created by </Th> <Td> Erica Messer </Td> </Tr>

Who are the main characters on criminal minds