The character's name is Ari Horrendous Haddock, and he's 16 years old. throughout he grows older, reaching 22 years old in the final installment, Ari's height also varies, starting from 5 feet in the first movie up to 5 feet 7 inches by the ending
...
'Scene opens at night, on a Dragon Trapper ship. Many dragons are locked in cages, while Ivar, a Dragon Trapper, patrols the area. One dragon roars in frustration, and Ivar taps on the cage'
Ivar the Witless: Quiet!
'Hiccup comes out of the fog wearing his dragon armor and lights up his Inferno'
Ivar: What are you?
Hiccup: Shh!
'Toothless climbs down a cage behind Ivar, with the spines on his back glowing blue. The Trapper then attacks Hiccup, who accidentally knocks a lamp, causing the floor to burst into flames. Hiccup and Toothless come out of the fire unharmed, thanks to the fireproof dragon scales.'
Ivar: AAH! YOU'RE A DEMON!
Hiccup: Shhh! Shh, shh, shh! No, no! I'm not a demon! I'm not a demon!
'Hiccup takes off his mask.'
Hiccup: See? Just a guy! Just a guy, here to rescue these dragons, so...
Ivar: But you walked through fire!
Hiccup: Dragon Scales! Dragons shed a lot.
Ivar: Ooh! I know a demon when I see one! No human legs are that skinny!
'Snotlout lands on a light up Hookfang behind the Trapper'
Snotlout: Think that's a good entrance? Get a load of me! Aah!
'Snotlout's butt catches on fire and the boy runs away'
Ivar: AAH! I KNEW IT! MORE DEMONS?!
Hiccup: That's really just a nitwit who forgot to fireproof his butt.
Snotlout: Hot! Hot, hot, hot! Guys! No! Not yet!
'Barf and Belch create a little explosion, which knocks down Snotlout, as the twins get off their dragon.'
Tuffnut: Behold, your worst nightmare...
Ruffnut: Behold--
Tuffnut: ...along with his sister who insisted on coming.
Ruffnut: That's my intro?
Hiccup: Guys! Too soon. You always come in too soon!
'Fishlegs lands on his back in front of Hiccup, slipping on the floor'
Fishlegs: Sorry, still getting the hang of my wings.
Hiccup: Fishlegs, again with the baby? This is a raid.
Fishlegs: I couldn't find a sitter.
'Ivar gets scared of the Dragon Riders in armor and runs away'
Ivar: DEMONS EVERYWHERE! IT'S THE END OF THE WORLD!
Then someone lands in front of him
Ari: Hey! Nice to meet ya
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