Who am I?

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Across
  1. 1. My favorite color is December's birthstone
  2. 5. I love jokes not told by mom, but by
  3. 6. I don't know how to knit but can
  4. 7. 안녕 is how my hs celeb crush would say hi in...
Down
  1. 2. What is DPHiE's mascot?
  2. 3. Catch me doing karaoke singing rock, paper,
  3. 4. My second favorite color is one of DPHIE's colors