The Secret?

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Across
  1. 1. Main character of Dragon Ball Z
  2. 6. Legendary island that sank (near the azores?)
  3. 7. Capital city of Byzantium
  4. 8. My Evangelion waifu (hihi)
  5. 9. Powerful european banking dynasty
  6. 10. Northernmost island of Japan
  7. 11. Element represented by an upside-down triangle in alchemy
  8. 12. King of Wessex, fought off the Viking invasion of England
Down
  1. 1. Hero of Sumerian Legend
  2. 2. Famous pianist who claimed Mozart was a bad composer
  3. 3. Ash's long-term companion pokemon
  4. 4. Name of the Pharaoh from Exodus (II)
  5. 5. Hit song recorded by Mariya Takeuchi in 1984