Yuki

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Personality before story(A Day In the Life of Pulverus)
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Yuki likes her personal space, but is still caring and observant, albeit from a distance.
She also has constant flashbacks to when her other dragonets and dappled snow were exiled.

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story
The only dragons she was willing to romp around with are Dappledsnow and the dragonets, unfortunately the dragonets she had with dappled snow were exiled leaving her to be in a depressed state of mind when she joined her current clan.
When Yuki joined her current clan she met a dragon named Pulverus, Yuki felt something similar to what she felt with dappledsnow so she accepted when Pulverus confessed his feelings. It wasn't true love though.
Yuki and Pulverus had 2 dragonets together named Kevin and James, Kevin the younger of the two got lost one day and when Yuki heard the news.
She realized that what she felt for Pulverus, wasn't real.

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changes to personality after story(A Day In the Life of Pulverus)
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She now has an unholy hatred for Pulverus for him losing the dragonet(partially because it reminds her of the time her other loved ones were exiled)
Yuki is also extremely overprotective of James and doesn't let Pulverus anywhere near him.