Here are some name suggestions, categorized for clarity:

Names Starting with "D":

• Darington "Dare" Dragon: Combines a strong, adventurous surname with a nickname that reflects youthful energy.
• Draco Dawn: Evokes a sense of mystery and a fresh start, fitting for an optimistic teen.
• Dylan Dragonheart: A classic name paired with a powerful, symbolic surname.
• Destiny Dragonfly: A whimsical name suggesting a character destined for great things, with a delicate touch.
• Darius Dragonwing: A strong, regal name with a fantastical element.

Names that Go with "Dragon":

• Sparky Dragon: A playful, energetic name.
• Ember Dragon: Suggests warmth, passion, and a fiery spirit.
• Blaze Dragon: Similar to Ember, but with a more intense connotation.
• Comet Dragon: Implies speed, excitement, and a bright future.
• Shadow Dragon: A more mysterious and intriguing option, potentially hinting at a hidden depth.
• Zephyr Dragon: Suggests lightness, speed, and a free spirit.

Names that capture youth and optimism (regardless of "D" or "Dragon"):

• Sunny Skies: Upbeat and cheerful.
• Hope Brightly: Optimistic and radiant.
• Kai Zenith: A blend of modern and aspirational.
• River Song: Peaceful and flowing, suggesting a calm yet adventurous nature.
• Leo Lumina: Bright and energetic.

Remember to consider the overall tone and style of your cartoon show when making your final selection. The best name will depend on the specific nuances of your character and their story.