Vinney

Vinney was a human who fell in the water and pricked himself on mutant coral(it exists later on) which was grown by Plankton and Plankton found him transforming and took him into the Chum Bucket and raised him to be his "son".

How he met Spongebob
Vinney first met Spongebob when Spongebob was Jelly fishing then Spongebob heard a strange noise in the seaweed finding Vinney wounded and first meeting him Spongebob tried to help but ran off in the process. When SpongeBob was in danger Vinney helped SpongeBob at first he didn't trust him at first considering he was raised by Plankton but that was resolved and they both became friends soon after and SpongeBob introduced him to the rest of his friends.

Episode Info
In "Son" of Plankton Spongebob meets Spongebob

In the rest of the fanon episode's, He does make appearances in all of them\

In the last fanon episode, Goodbye Friend Vinney says goodbye to the gang that he met and gave SpongeBob and the gang gifts as a present SpongeBob became upset but Vinney told him that "Goodbye's aren't forever" and that he will return to Bikini Bottom soon enough.

He will make is debut in season 2 of my fanon episode's

Voice Actor
He is voiced by Mel Blanc who had died in 1989 but we'll say that he's alive.

He is later voiced in season 2 by both Mel Blanc and Thorax's(MLP) voice actor