|Age:||15 or 16?|
|Eye Color:||Grayish green|
|First Appearance:||The Day the Sea Stood Still|
Heidi is one of Lo's old friends, who was seen chatting with Lo after she briefly moved back to the Penthouse. Lo wanted to do surfing-related things with Heidi after they reunited, but Heidi, who is a non-surfer, declined and then excused herself so she could leave.
- The Day the Sea Stood Still (only appearance)