Here are some MHA-style names fitting the description "dragon master, quirkless, quiet, smart, shady":

Sophisticated & Mysterious:

• Seraphina Drakon: Evokes a sense of angelic grace juxtaposed with the dragon theme, hinting at hidden power.
• Lysander Nightshade: Combines a classic, somewhat mysterious name with a subtly ominous surname.
• Silas Umbra: "Umbra" meaning shadow, perfectly captures the shady aspect. Silas is a quiet, strong name.
• Zephyr Obsidian: Zephyr suggests a quiet, swift nature, while Obsidian hints at a dark, hidden strength.
• Revenant Drake: Suggests a character who has returned, perhaps with hidden knowledge or power related to dragons.

More Direct & Powerful:

• Draco Shadow: Simple, yet effective in conveying the dragon and shady aspects.
• Ignis Rex: "Ignis" (fire) and "Rex" (king) suggest a powerful, potentially hidden, dragon-related ability.
• Shadowscale: A single word name that directly reflects the character's quiet, shady, and dragon-related nature.

Unique & Evocative:

• Aethelred Wyrm: Aethelred is an old English name with a slightly mysterious feel, paired with the dragon-related "Wyrm."
• Rhys Serpentina: Rhys is a Welsh name meaning "ardor," which could be a hidden passion for dragons. Serpentina adds a subtle, shady edge.
• Kaito Drakonis: Kaito, meaning "clever" or "wise," fits the smart and quiet aspects, while Drakonis adds a sophisticated dragon element.

Consider these variations:

• You can combine elements from different names above to create something new.
• Add a middle name for more complexity.
• Experiment with different spellings or prefixes/suffixes to personalize the name further.

Remember, the best name will depend on the specific nuances of your character and the overall tone of your story. Consider which name best embodies the quiet intelligence, shady dealings, and hidden dragon mastery of your character.