This Tintin.
His full name isn't —
This Tintin.
Although same initial is a Hollywood thing. This Tintin.
The answer is:
I Don't Know.
His full name isn't "I Don't Know" either.
Well, such revelation. Very relieving. And not revealing anything.
Anyway, everybody calls him Tintin in those comic books and the telly cartoon. It's a fictional character, so you may imagine the full name — either by yourself or as a collective.
So how about Asterix's full name?