Answer: Astrid
The twins, Ruffnut and Tuffnut were talking about how the wanted to have a few battle scars to show off after their training. Tuffnut said he wanted some "serious burns," while Ruffnut said she wanted some "mauling, like shoulder or lower back." Astrid then jumped in and said, "Yeah, it's only fun if you get a scar out of it." Hiccup, who was standing behind the group chimed in and said sarcastically, "Yeah, pain... love it." Soon after, the teens began their training under the watchful eye of Gobber.