Sorry there's Spanish in there, I have no idea why there isn't a lyric video without SPANISH UNDER THE ENGLISH XD.

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I think this one really suits Abby because 

She's such an encouraging little baby! She's always there for everyone, smiling and just being herself to brighten their day. She's such a sweetheart who loves everyone with all her heart, especially Kai and Shintaro. 

I think this song would be her basically talking to Kai or Shintaro when they are upset or just had a nightmare. 

I'll be the place you run to hide (She's the arms that Kai and Shintaro go to when they need tight hugs that remind them of who they are or who they aren't, that they're important and loved.)

The heart when you need to fight (She will fight for them with all her heart, soul, mind, and strength because she loves all of her friends!!)

A flickering flame when you need to light all of your nights (She'll be the light that will spark a flame in anyone's troubled minds. When they're upset, she comes to them with her cheerfulness and helps them feel better.)

I'll be the sun chasing your clouds (When anyone, especially her family, is in a bad mood, she always chases it away with her sunshine.)

The truth when your feeling doubt (Since Kai doubts himself a lot, this line is mostly for him. She is always there for him, making him realize the things he's doubting are true about him. Stuff like: No one hates him, everyone loves him, he's good enough for Abby.) 

All of the waves crashing on shore (When anyone is hurting, basically.)

I will protect you from all that and more (If anyone was going to attack her family and friends, I can picture in my mind that she would literally stand in front of them and take the blow instead. I mean, think about what she did with Zeke XD.)

Okay, I'm done now XD Sorry, this whole song just makes sense for her so much!!