Walter White (Breaking Bad) vs Walter Bishop (Fringe)

It's scary how these two are alike, and yet unlike.

Both:

• Scientists.
• Vastly underestimated among their field, yet recognized by a specific few.
• Gave up, or lost their potential.
• Contributed to a downward spiral. For Walt, this was his family. For Bishop, this was his son's future, and the universe as a whole.
• Affiliated with drugs.
• Went to great efforts to cover their lies.
• Have megalomaniacal alter egos that are dramatically portrayed on-screen, even as separate characters.
  • Their alter egos are highly successful men of power and influence.
• Both alter egos are more violent.
• Major operations affected their current states.

Bishop:

• Uses drugs to enhance his science.
• Uses drugs to save the day and solve supernatural cases.
• Aloof, but brilliant and loyal.
• His lies were born out of love, designed to protect his son.
• A brain surgery reduced him from the pointed, scientific mind he used to be, to an gibbering, unstable woobie who, nonetheless, is doing more to help the world.
• His alter ego Walternate is a general in charge of a militant division.
• Family is a cause.

White:

• Uses drugs as a platform for his own talent as a chemist.
• Uses drugs to make money and often evades the law.
• Acts aloof, is loyal only to himself, and is somewhat gullible.
• His lies became pure deceit, designed to protect himself. Eventually, he even managed to deceive himself.
• His cancer diagnosis forced him to take a level in badass, to leave the measly role of a school teacher and become a figure in the criminal underworld.
• His alter ego is a mythical kingpin who sells the finest quality product.
• Family is an excuse.