What actor/actress plays against their appearance the best (ie the person looks like a bad guy/evil female but his/her character is a good person)?

This guy:

Danny Trejo

His physical demeanor can be intimidating and he plays some bad-ass characters. In the picture above, he portrays a knife wielding assassin.

Danny Trejo Talks Danny Trejo from IMDb Me (2018-) (awesome video interview)

Trejo was born in the Echo Park neighborhood of Los Angeles, California, to Mexican parents.

He is the son of Alice Rivera and Dionsio “Dan” Trejo (1922–1981), a construction worker, and a second cousin of filmmaker Robert Rodriguez, though the two were unaware that they were related until the filming of Desperado.

Prior to his film career Trejo worked as a labor foreman in construction.

Throughout the 1960s, Trejo was in and out of jail and prison in California; Trejo has suggested that his physical appearance contributed to his constantly getting into trouble. There are conflicting accounts of his prison chronology. By one account, his final term in custody ended in 1972; by another account, he did time in a juvenile offenders’ camp and six California prisons between 1959 and 1969.

He recalled that his last prison term was five years. While serving in San Quentin Prison, he became a champion boxer in that prison’s lightweight and welterweight divisions.

During this time, Trejo became a member of a twelve-step program, which he credits with his success in overcoming drug addiction. In 2011, he recalled that he had been sober for 42 years. From Danny Trejo — Wikipedia

Mr. Trejo’s rough origins and affinity for Boxing have given him the stature and acting chops to be one of Hollywood’s genuine tough guys.

Danny Trejo

Danny Trejo, Hollywood tough guy and genuine movie star!

(This article is from a question asked on Quora.com)

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Danny Trejo T-shirts

Danny Trejo Movies

Danny Trejo autographed items and posters, eBay

Did old school actresses like Joan Crawford really have their molars removed? And if yes, why?

Steve Martin as the dentist in the little shop of horrors https://amzn.to/2zvrp5G
By Alan Chenkin, Learned about celebrities by reading the tabloids in the checkout aisle.
While it is no secret that stars did some serious dental work to maintain their famous smiles, I found some good background on this:
Joan Crawford, on eBay https://rover.ebay.com/rover/1/711-53200-19255-0/1?mpre=https%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_from%3DR40%26_trksid%3Dp2380057.m570.l1313.TR12.TRC2.A0.H0.Xjoan%2Bcrawford.TRS0%26_nkw%3Djoan%2Bcrawford%26_sacat%3D0&campid=5337761896&toolid=20008
Joan Crawford’s Painful Legacy
Legendary Hollywood beauty Joan Crawford was plagued with dental problems. Undergoing a similar procedure as Dietrich and having teeth removed to accentuate her cheeks had left Crawford with ongoing problems. After the extraction, her front teeth were spaced out and filled with dentist’s cement before being filed down to be fitted with caps. This painful treatment left her uncomfortable and ultimately led to her gums becoming infected. Her whole mouth swelled up as a result of the infection and left her with a large upper lip which never returned to its normal size. She was pleased with this one side-effect and subsequently became known for her full and distinctive lips. Crawford enjoyed one of the longest and most successful careers Hollywood has ever seen but suffered with dental issues for the rest of her life. In her late 60s major dental surgery left her requiring round-the-clock medical care.[1][2] (Footnotes contain information on other actors too; I highlighted the quote as it directly answered the Joan Crawford part of the question).
The all-powerful studios of Hollywood were uncompromising in their quest for the perfect star. Many young actors and actresses were groomed, enhanced and tweaked beyond all recognition to ensure they fitted in with the studio executive’s idea of beauty. Some stars were expected to go further than others and Marlene Dietrich is believed to have had several molars removed to enhance her looks.[3]
As to why, that is very clear – the prettiest smiles can get the best roles and the biggest box office. Although one film stands out – Tom Hanks in “Cast Away”. (No spoiler, you should watch it as to why I included it).  
May your smile never give you the troubles these stars have had!
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Footnotes

 

UPDATE:

(Honorable Mention) Mike Myers as Austin Powers wore a set of bad teeth, and John Turturro wore a set of terrible redneck teeth in “Oh Brother Where art Thou”.

Mike Myers as Austin Powers
John Turturro as “Pete” in  “Oh Brother Where art Thou”.
Thanks for reading my blog!  Feel free to like, upvote, and share.
Edited  and expanded from my answer in Quora.
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