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I guess you're talking about Patrick. His name is Patrick Star.
Patrick loves his girlfriend.
Sing a Song of Patrick- Twinkle, Twinkle, Patrick Star (I Wrote This)
SpongeBob's best friend is Patrick Star who is a pink starfish that lives under a rock in Bikini Bottom as Squidward and SpongeBob's neighbor.
Is other friends, some of which do not like him at times, are:
Bill Fagerbakke plays the voice of Patrick Star.