Character types in Dickens

Dickens is of course known for his sharp delineation of character; some of his characters are all-good (right now I'm reading Little Dorrit, and the eponymous Amy Dorrit is an example of pure benevloence; Esthe Summerson in Bleak House as well, and some of his male protagonists perhaps such as Copperfield or Pip - others abound) and others are all-bad (Fagin, Mr. Gradgrind if I have the name correct), but his most significant and original characters are those who think they're bad but are actually good (see Great Expectations) and, in particular, those who think they're good but are actually bad - e.g., Mrs Jellybellly (?) in BH, who is devoting her life to the care of children in The Congo while completely oblivious to the needs of her own children, living in neglect and squalor. Mr. Dorrit, Amy/Little D's father, is a perfect example of the "thinks he's good" character: He makes a big today about how he is the "Father of th Marchalsea," which is to say the longest-dwelling member on the London debtors' prison, and does nothing to try to better his life while living off the labor of his younger daughter an in his officious manner extorting "gifts" from those who visit the prison; he acts as if his meeting each visitor and newly arrived prisoner is an act of kindness and benevolence, and that all of these visitors and prisoners find it a great honor to have an audience with the "Father," while in fact he's  just a lazy extortionist who exploits others, his family included. His mild manner and seeming politesse mask, for a time, the essential laziness and greediness of his character. Dickens's sympathies are obviously w/ the prisoners - the debtors' prison was a terrible institution that had already, I believe been abandoned by the time Dickens was writing LD, in the 1860s or so?, but part of Dickens's greatness as a writer is that he is neither servile nor sympathetic to all those exploited and ruined by the corrupt prison system; some of them, such as Mr. Dorrit, are both victims and executioners.