[ johnny is truant ]

Alignment: True Neutral
Color: Purple
Element: Fire
Season: Winter
Zodiac: Gemini/Cancer cusp
Myers-Briggs: ISFP
Hogwarts House: Ravenclaw (barely)
Dæmon: Netherland dwarf rabbit (Novatiana)

Associated Tropes:
Lemony Narrator (I'd like to note that at times Johnny IS kind of narrating a Lemon)
Meaningful/Prophetic Name
Obfuscating Stupidity
Really Gets Around
Sir Swears-a-Lot
Through the Eyes of Madness
Unreliable Narrator

there are probably more but these were mined from a brief runthrough of the HoL page on TVTropes