Here are the list of characters that has an account and their names:

Tintin ~ @CuriousTintin (me)
Chang Chong-Chen ~ @GoofyChineseBoy
Captain Haddock ~ @BBlueBarnacles
Professor Calculus ~ @notactingagoat
Abdullah ~ @PrincePrankster
Sakharine (movie version) ~ @IvanSakharine
Piotr Skut ~ @PiotrSkut
The Yeti (the yeti from "Tintin in Tibet") ~ @GentleYeti

Open spots for characters (wanted)

Nestor
Thompson
Thomson
Bianca Castafiore
General Alcazar
Rastapopolous
and Allan

Please contact @CuriousTintin or comment below for more info