Phineas Flynn

Phineas Flynn or Triangle head, is a triangle headed kid who can do anything.

Bio
He was born in some year, along with Ferb, only Ferb was born in England, by Phineas's step-father, on some different month and day.

Phineas is a cheerful kid that spends his summers doing stuff that his mother doesn't know. Candace really should know that it is 1 out of 1,000,000,000,000,000,000 that she will bust her brothers.

Building
Phineas hangs out with his brother, Ferb Fletcher, a british kid who barley talk or shows emotions, and is thought to be a dull robot. Along with Ferb, Phineas can, and I repeat CAN build ANYTHING. It is possible that the people who give him stuff to build his crazy inventions, are as Ren says:

or just very hopeful that Phineas is smarter than Spongebob.

Trivia
Phineas is a triangle with a body.

Ferb is actually Phineas's brother.

Phineas can't survive without building things.