"Please don't say "Good nightrogen" to me, I've heard that joke far too much."

Niall is a pretty stoic guy most of the time, but on rare occasions he can be really nice and outgoing. This is a reference to Nitrous oxide aka laughing gas, and on top of that Niall has a very good sense of humour, even when he's being stoic, however don't let all that fool you, he's tougher than he looks as one of his hobbies is boxing in reference to his group's name "pnictogen" which means "to choke". Additionally he's good friends with Robert, however Lídia and Magnolia don't like him that much, the reason being their elements can burn in nitrogen.