It sounds like you are envisioning a fusion of several distinct universes: the mystical Nordic , the high-energy martial arts world of Dragon Ball , the massive 3D arena combat of Sparking! ZERO (the upcoming Budokai Tenkaichi sequel), and the archetypal Hero of Justice .
"Body Change!" Rune-Dragon (carving ᚱ for journey in the air): "Your sorcery has no power over a soul bound by the Elder Script. You cannot steal what is already sworn to justice." rune-dragon.ball.sparking.zero.hero.of.justice-...
Here is an original text that weaves these concepts together into a single character profile and scenario. Alias: The Futhark Fist Signature Phrase: "By the Runes of Old and the Spark of Zero—Justice is Absolute!" It sounds like you are envisioning a fusion