She is Marina in reality.
Clamantha is obsessed with Oscar and follows him around. She has a lot of nicknames for him. One is "Dream-hottie" Clamantha's locker is a shrine to Oscar.
Bea and Clamantha are good friends. They are seen with each other a lot in the show and Clamantha gives Bea advice.
Now much is known about Clamantha and Milo's relationship, because they are rarely together.
- Clamantha has a fishbook account whic can be seen here http://tv.disney.go.com/disneychannel/fishhooks/fishbook/index.html
- Clamantha is seen wandering about the halls occasionally saying "I'm a teenage clam"
- The name Clamantha is based off Samantha