Mortal Instruments & Infernal Devices Lovers! discussion

This is going to be a Roleplay set when both will and Jem were alive and not about to die (by that I mean lying sick) and when they still didn't know what Tessa was

Tessa sit in her room in the institute wondering why Jem was acting so strange he was fine ever since two days ago but then suddenly he kept acting as if he was being interrogated. Always acting nervous and choosing his words carefully and whenever someone enters the library and he's there he always closes his book puts it back and goes straight out of the library without saying a word........

(Can I create a character of my own and join in the RP?)