Black Lagoon = Richie Rich

Black Lagoon
They have a white dog, a maid named Roberta (only servant/protector), a wealthy father (grows cocaine), a dead wife, and an interesting collection of Mob-tied mercenaries.

Richie Rich
Poor little rich boy who always has things go his way (cannot lose money).
Roberta, robot maid with super-strength and a bit literal of a servant.
A white Dollar-mation (dalmatian with dollar signs on the fur).
Cadbury the Butler (combat strong, but extremely obedient).
Professor Keenbean (creates gadgets sometimes the center of the plot).
Parents Richard Rich Sr. & Regina Rich (a bunch of wealthy relatives tend to be idiots or jerks).

If you think about it, some of the Mob-mercenary/pirate characters from "Black Lagoon" coincide with Richie Rich's friendbase.

Roberta = Roberta the robot maid
The Lagoon Company
Garcia Lovelace = Richie Rich
Rokuro "Rock" Okajima = Pee-Wee Friendly
Revy = Gloria Glad


Richie's friends

Gloria Glad - Richie's redhead girlfriend, notorious for her regular refusal of the many luxurious gifts Richie offers, and for her disdain for the open display of money, diamonds and other forms of wealth in Richie's household, despite his efforts to conceal it from her. Regardless, she always wins his attentions in comparison to Mayda Munny.
Mayda Munny - (whose name is a play on the phrase "made of money") Richie's snobby wannabe-girlfriend, who never wins his attentions. Immensely jealous of Gloria, and often angry when her plans to snare Richie's attention backfire on her. Like Reggie, Mayda is snobbish and addresses those beneath her as "peasant".
Freckles and Pee-Wee Friendly - Richie's poor but most-prized friends (first appearance Little Dot #2)

Van Dough family

Reginald "Reggie" Van Dough Jr. - Richie's mean cousin, known for playing constant pranks on everyone, most notably Richie and his family, which causes his father to punish him. Treats his servants shabbily (often by calling them "peasant," which causes them to call him "monster", but they swiftly correct themselves and call him Master). (first appearance Little Dot #2)