Plankton

Life
Before his so called "Faliures" of course he had a life. So first. He was born and then grew up and made friends with Mr.Krabs. But then things went worse when Eugene made a better Krabby Patty Formula. So then when they grew up he made the "Chum Bucket" and Euegene made the Krusty Krab. And then eversince then, Plankton has been trying to get the Seceret Formula. Why he fails? Mostly of his size

Family
Karen (Computer Wife)

Personality
Plankton would do anything to get the Krabby Patty Formula. So most of the time he's angry! Other times he has that Evil happy look.(Seen in Episode Spongicus)

As far as I seen, Plankton has no friends (except his cousins) and doesn't want to have any. And in a lot of episodes, Planlton is sad about his Faliures.