Mia or Lena for a character in my story?

I think Mia fits better, although I like the name Mia a little better so I might be biased. If not Mia, maybe Shayla? Probably Mia though. Lena makes me think of a really bubbly, upbeat girl. Although, Elena, which is almost the same, kind of makes me think of a quieter girl... I don't know.