The protagonist of Sophistication And Betrayal tends to get quite easily riled up if anyone threatens or insults Rarity, and is called out on this several times as it being unproductive, scary, or inappropriate to the situation.
Shinji and Warhammer 40k manages to turn Shinji Ikari into someone who, when first got into Eva 01, rather than letting the killing machine go berserk, used it to try and kick the angel in the balls; and in his childhood, beat the crap out of three teenagers. That's the prologue and chapter one.
"Cast in the shape of man! Made to fight humanities' enemies! You shall carry our will unto eternity! I NAME YOU! EVANGELION! I NAME YOU; TITANICUS! PRINCIPIO ETERNUS!"
Sean O' Callahan, Power Rangers GPX Red Ranger. When calm, he's a tactical, thoughtful leader but when he gets riled up, he lets loose. His Hot Blood is so hot it gets his fellow Rangers to fight back when they're down for the count. The other Rangers have Hot Blooded moments, but nothing compared to him.