<P> Dennis is Deandra's twin brother and co-owner of Paddy's . He is narcissistic, selfish, histrionic and vain, perpetuated by his Ivy League education at the University of Pennsylvania . Dennis is repeatedly implied to be a sociopath, and in one episode was diagnosed with borderline personality disorder and prescribed medication . His sense of self - worth is entirely dependent on what others think of his appearance and he often suggests the best way to sleep with a woman is to make her think she may be raped or by using his personal system, the D.E.N.N.I.S. system (a satire of seduction community techniques for bedding women). Some episodes hint that Dennis may be a serial killer and rapist, though this remains ambiguous, with one episode suggesting that he collects suitcases made of human skin . He even threatens to kill his sister, cut her body into small pieces, and put those pieces into a glass box and put it on display . He is revealed to be an atheist in the season 7 episode "Sweet Dee Gets Audited ." Multiple episodes have shown Dennis to be bisexual, often as a result of his pandering to attention or his need to "get off" no matter the situation . He is also a big fan of the music of Rick Astley and Steve Winwood . He is played by Glenn Howerton . </P> <P> Deandra (usually called Dee or Sweet Dee) is Dennis' twin sister, the main bartender at Paddy's, and the show's main female character . She is most often subject to ridicule from The Gang in many different forms: they call her extremely ugly (resembling a bird in a negative and humorous way), lazy, and completely talentless . They don't count her as one of the gang, but rather as just someone who works for them . Dee dreams of becoming an actress even though she has no acting experience and no talent; however, she deludes herself into falsely thinking she is a talented actress, comedian, and singer . Like her brother, Dee is egocentric and often states that she thinks she is talented and pretty, although she is constantly told otherwise; as an example, she has been told she is "a disgusting whore" and "looks like a Holocaust victim". She is played by Kaitlin Olson . </P> <P> Frank is the legal (but not biological) father of twins Dennis and Dee, and possibly the biological father of his roommate Charlie . He constantly carries a gun with him and frequently pulls it out for any number of situations . He used to be a successful businessman with a long history of illegal operations (such as running sweat shops and drug - dealing) and dealings with sordid characters . Owning fifty one percent of shares at Paddy's Pub, Frank' The Captain of the Gang' is considered to be the defacto boss and makes a majority of the business decisions at the bar . Though he is fairly wealthy and has the money to live elsewhere, he chooses to live in squalor with Charlie in order to add excitement to his life following his split from his ex-wife Barbara, who he frequently refers to as his "whore wife". This lifestyle choice involves eating cat food, living on about five dollars a week, keeping a mini meats fridge in his apartment, as well as sausages in his shirt pocket and sharing a bed with Charlie, which is also their couch . He is the only member of the gang to involve himself with politics, frequently ranting about how bad the government is . He doesn't believe in or trust psychiatrists, and was admitted into a school for clinically insane children for a short while as a child, before he was cleared of any legal mental issues and received a certificate stating that he did not have donkey brains . He is frequently seen in strip clubs, and sleeping with prostitutes (even becoming engaged to a "crack whore" in the season 7 premiere). He is portrayed by Danny DeVito . </P> <Table> <Tr> <Th> Character </Th> <Th> Actor </Th> <Th_colspan="12"> Seasons </Th> </Tr> <Tr> <Th> </Th> <Th> </Th> <Th> </Th> <Th> </Th> <Th> 5 </Th> <Th> 6 </Th> <Th> 7 </Th> <Th> 8 </Th> <Th> 9 </Th> <Th> 10 </Th> <Th> 11 </Th> <Th> 12 </Th> </Tr> <Tr> <Td> The Waitress </Td> <Td> Mary Elizabeth Ellis </Td> <Td_colspan="7"> Recurring </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="1"> Guest </Td> </Tr> <Tr> <Td> Ernie </Td> <Td> David Zdunich </Td> <Td_colspan="5"> Recurring </Td> <Td_colspan="7"> </Td> </Tr> <Tr> <Td> Bonnie Kelly </Td> <Td> Lynne Marie Stewart </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="2"> Recurring </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="2"> Recurring </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> </Tr> <Tr> <Td> Liam McPoyle </Td> <Td> Jimmi Simpson </Td> <Td_colspan="2"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> Guest </Td> <Td_colspan="3"> </Td> </Tr> <Tr> <Td> Ryan McPoyle </Td> <Td> Nate Mooney </Td> <Td_colspan="2"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> Guest </Td> <Td_colspan="3"> </Td> </Tr> <Tr> <Td> Artemis Dubois </Td> <Td> Artemis Pebdani </Td> <Td_colspan="3"> Guest </Td> <Td_colspan="3"> Recurring </Td> <Td_colspan="2"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> </Tr> <Tr> <Td> Carmen </Td> <Td> Brittany Daniel </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="6"> </Td> </Tr> <Tr> <Td> Barbara Reynolds </Td> <Td> Anne Archer </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="10"> </Td> </Tr> <Tr> <Td> Matthew "Rickety Cricket" Mara </Td> <Td> David Hornsby </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="2"> Recurring </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="2"> Recurring </Td> <Td_colspan="2"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> Recurring </Td> </Tr> <Tr> <Td> Mrs. McDonald </Td> <Td> Sandy Martin </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="2"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> </Tr> <Tr> <Td> Margaret McPoyle </Td> <Td> Thesy Surface </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> </Tr> <Tr> <Td> Luther McDonald </Td> <Td> Gregory Scott Cummins </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="3"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> </Tr> <Tr> <Td> The Lawyer </Td> <Td> Brian Unger </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> </Tr> <Tr> <Td> Duncan </Td> <Td> David Gueriera </Td> <Td_colspan="3"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="6"> </Td> </Tr> <Tr> <Td> The Waiter </Td> <Td> Michael Naughton </Td> <Td_colspan="3"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="3"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="2"> </Td> </Tr> <Tr> <Td> Ben Smith </Td> <Td> Travis Schuldt </Td> <Td_colspan="4"> </Td> <Td_colspan="2"> Recurring </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="3"> </Td> </Tr> <Tr> <Td> Brad Fisher </Td> <Td> Nick Wechsler </Td> <Td_colspan="4"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="5"> </Td> </Tr> <Tr> <Td> Maureen Ponderosa </Td> <Td> Catherine Reitman </Td> <Td_colspan="5"> </Td> <Td_colspan="2"> Recurring </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> </Td> <Td_colspan="3"> Guest </Td> </Tr> <Tr> <Td> Bill Ponderosa </Td> <Td> Lance Barber </Td> <Td_colspan="5"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="4"> Guest </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="1"> Guest </Td> </Tr> <Tr> <Td> Z </Td> <Td> Chad Coleman </Td> <Td_colspan="5"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Guest </Td> </Tr> <Tr> <Td> Brian McIntyre </Td> <Td> Dave Foley </Td> <Td_colspan="5"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="2"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="3"> </Td> </Tr> <Tr> <Td> Nick </Td> <Td> Windell Middlebrooks </Td> <Td_colspan="5"> </Td> <Td_colspan="1"> Recurring </Td> <Td_colspan="6"> </Td> </Tr> <Tr> <Td> Old Black Man </Td> <Td> Wil Garret </Td> <Td_colspan="10"> </Td> <Td_colspan="1"> Guest </Td> <Td_colspan="1"> Recurring </Td> </Tr> </Table>

Who plays frank in it's always sunny