Here is a list that I made for Underground Gamer. I couldn't link anyone there, considering it's a invite-only website. So here you go...
Ok... decided to make a list of the Kunio-kun series, which River City Ransom falls into.
Nekketsu Kōha Kunio-kun: Arcade - The first game in the series, in the original Nekketsu Kōha Kunio-kun, "Hot-Blooded Tough Guy Kunio" the player takes control of Kunio as he fights against the various gangs who bully his friend Hiroshi at the start of each stage. Known as Renegade in America.
Nekketsu Kōha Kunio-kun: Famicom - Based on the Nekketsu Kōha Kunio-kun arcade game, the Famicom version was Technos Japan's first game for the home console market. Known as Renegade in America
Nekketsu Kōkō Dodgeball Bu: Arcade, X68000 - Nekketsu Kōkō Dodgeball Bu is the second game starring Kunio and the first sports game starring the character. In this game, Kunio leads his school's dodgeball team (Nekketsu High School) as he competes against the rival Hanazono High School, and then proceeds to compete against five international teams (England, Iceland, China, Africa, and America). Known as Super Dodgeball in America.
Nekketsu Kōkō Dodgeball Bu: Famicom, PC - Nekketsu Kōkō Dodgeball Bu, (Nekketsu High School Dodgeball Club) is the second Kunio game for the Family Computer. The game adds two new teams, India and the USSR. Also known as Super Dodgeball in America.
Downtown Nekketsu Monogatari: Famicom, X6800, PC Engine - Downtown Nekketsu Monogatari is the third Kunio game and the first produced specifically for consoles. Kunio teams up with rival Riki in order to save Riki's girlfriend from the Reihō High School gang. The game is a side-scrolling beat-em-up which combined RPG elements such as buying items and equipment that would increase the player's stats or acquire new moves. Also known as River City Ransom in America.
Nekketsu Kōkō Dodgeball Bu: PC Bangai Hen: PC Engine - Nekketsu Kōkō Dodgeball Bu: PC Bangai Hen, Nekketsu High School Dodge Ball Club: PC Extra Edition is a special version of the original Dodge Ball which combines the graphics and teams of the arcade version with the emphasis on character-specific statistics and team formation. Features an arcade-style mode and a plot-oriented Quest Mode.
Nekketsu Kōkō Dodgeball Bu: Soccer Hen: Famicom, PC Engine - The fourth Kunio game, Nekketsu Kōkō Dodgeball Bu: Soccer Hen , Nekketsu High School Dodgeball Club: Soccer Edition features Kunio and the dodgeball team helping Misako, the manager of the Nekketsu Soccer Club, as they participate in a national soccer tournament against other schools. Also known as Nintendo World Cup in America.
Downtown Nekketsu Kōshinkyoku: Soreyuke Daiundōkai: Famicom, PC Engine - In Downtown Nekketsu Kōshinkyoku: Soreyuke Daiundōkai, Downtown Nekketsu March: Let's Go to the Great Athletic Meet) features Nekketsu competing against three other teams (Hanazono, Reiho, and an inter-school union) compete in a series of four athletic events. Up to four players can participate.
Nekketsu Kōha Kunio-kun: Bangai Rantō Hen: Gamboy - Nekketsu Kōha Kunio-kun: Bangai Rantō Hen, Nekketsu Tough Guy Kunio: The Further Brawls is the first Kunio game for a portable system.
Nekketsu Kōkō Soccer Bu: World Cup Hen: Gameboy - Nekketsu Kōkō Soccer Bu: World Cup Hen, Nekketsu High School Soccer Club: World Cup Edition) is a Game Boy version of Soccer Hen based on the international version of the game Nintendo World Cup.
Downtown Special: Kunio-kun no Jidaigeki da yo Zen'in Shūgō!: Famicom, Game Boy - Downtown Special: Its Kunio's Period Piece, Assemble Everyone!! is a follow-up to Downtown Nekketsu Monogatari in which the characters act out a period play.
Nekketsu Kōkō Dodgeball Bu: Kyôteki! Dodge Soldier no Maki: Gameboy - Nekketsu Kōkō Dodgeball Bu: Kyôteki! Dodge Soldier no Maki, Nekketsu High School Dodgeball Club: Fierce Rival! Episode of the Dodge Soldiers is a Game Boy specific version of Nekketsu Kōkō Dodgeball Bu.
Nekketsu Kōkō Dodgeball Bu: CD Soccer Hen: PC Engine - Nekketsu Kōkō Dodgeball Bu: CD Soccer Hen, Nekketsu High School Dodgeball Club: CD Soccer Edition is a version of Soccer Hen released for the PC Engine Super CD-ROM² by Naxat Soft.
Ike Ike! Nekketsu Hockey Bu: Subette Koronde Dairantō: Famicom - Ike Ike! Nekketsu Hockey Bu: Subette Koronde Dairantō, Go Go! Nekketsu Hockey Club: "The Great Free-for-All Brawl" centers around Kunio's attempt to help out his school's hockey club.
Nekketsu Kōkō Dodgeball Bu: PC Soccer Hen: PC Engine - Nekketsu Kōkō Dodgeball Bu: PC Soccer Hen, Nekketsu High School Dodgeball Club: PC Soccer Edition is a version of Soccer Hen released for the PC Engine Hu-Card.
Bikkuri Nekketsu Shinkiroku: Harukanaru Kin Medal: Famicom - Bikkuri Nekketsu Shinkiroku: Harukanaru Kin Medal, Astonishing New Records of Nekketsu: The Distant Gold Medal is a sequel to Downtown Nekketsu Kōshinkyoku. Also known in America as Crash ' The Boys - Street Challenge.
Downtown Nekketsu Kōshinkyoku: Dokodemo Daiundōkai: Gameboy - Downtown Nekketsu Kōshinkyoku: Dokodemo Daiundōkai, Downtown Nekketsu March: The Great Portable Athletic Meet is a Game Boy-specific version of Koshinkyoku.
Shodai Nekketsu Kōha Kunio-kun: Super Famicom - Shodai Nekketsu Kōha Kunio-kun, The Original Nekketsu Tough Guy Kunio is the first Kunio-kun game released for the Super Famicom. It is a beat-em-up RPG set during the end of Kunio's second high school year as he and his friends take a school trip to Osaka.
Nekketsu Kōkō Dodgeball Bu: MD Soccer Hen: Megadrive - Nekketsu Kōkō Dodgeball Bu: MD Soccer Hen, Nekketsu High School Dodgeball Club: MD Soccer Edition is a Mega Drive-specific version of Soccer Hen. This is the only version where all the teams are playable in the 2 Player Exhibition Mode.
Nekketsu Kakutō Densetsu: Famicom - Nekketsu Kakutō Densetsu, Nekketsu Fighting Legend is a tournament-style fighting game.
Kunio-kun no Nekketsu Soccer League: Famicom - Kunio-kun no Nekketsu Soccer League is the Famicom sequel to Soccer Hen.
Bikkuri Nekketsu Shinkiroku: Dokodemo Kin Medal: Gameboy - Bikkuri Nekketsu Shinkiroku: Dokodemo Kin Medal, The Astonishing New Records of Nekketsu: Portable Gold Medal is a Game Boy-specific version of Shinkiroku.
Kunio-kun no Dodgeball da yo Zen'in Shūgō!!: Super Famicom - Kunio-kun no Dodgeball da yo Zen'in Shūgō!!, It's Kunio's Dodgeball, Assemble Everyone! is the Super Famicom sequel to the original Dodgeball for the Famicom.
Nekketsu! Street Basket: Ganbare Dunk Heroes: Famicom - Nekketsu! Street Basket: Ganbare Dunk Heroes is the final Kunio-kun game for the Family Computer. It's a basketball game with Kunio.
Downtown Nekketsu Baseball Monogatari: Yakyū de Shōbu da! Kunio-kun: Super Famicom - Downtown Nekketsu Baseball Monogatari: Yakyū de Shōbu da! Kunio-kun, The Baseball Tale of Downtown Nekketsu: Its a Baseball Match! Kunio-kun is the third Kunio game for the Super Famicom.
Shin Nekketsu Kōha: Kunio-tachi no Banka: Super Famicom - Shin Nekketsu Kōha: Kunio-tachi no Banka, The New Nekketsu Tough Guy: The Elegy of Kunio and Co.
Kunio no Oden: Super Famicom
Nekketsu! Beach Volley da yo: Kunio-kun: Gameboy
Kunio no Nekketsu Dodgeball Densetsu: Neo Geo - Kunio no Nekketsu Dodgeball Densetsu, known in English as Super Dodge Ball is the final Kunio game released by Technos Japan before the company went out of business. The game was never formally released in Japan and only saw limited release as an MVS-only Neo-Geo release in North America.
Downtown Nekketsu Monogatari EX: Gameboy Advance - The first Kunio game produced by Million. Known as River City Ransom EX in America.
Kunio-kun Nekketsu Collection 1: Gameboy Advance - 2-in-1 compilation which includes the Famicom versions of Nekketsu Kõkõ Dodgeball Bu and Nekketsu! Street Basket.
Kunio-kun Nekketsu Collection 2: Gameboy Advance - 2-in-1 compilation which includes the Famicom versions of Nekketsu Kōkō Dodgeball Bu: Soccer Hen and Downtown Nekketsu Kōshinkyoku.
Kunio-kun Nekketsu Collection 3: Gameboy Advance - 2-in-1 compilation which includes the Famicom versions of Downtown Special: Kunio-kun no Jidaigeki da yo Zen'in Shūgō! and Ike Ike! Nekketsu Hockey Bu: Subette Koronde Dairantō.
Super Dodgeball Brawlers: Nintendo DS - Released in Japan as Chō Nekketsu Kōkō Kunio-kun Dodgeball Bu, Super Nekketsu High School Kunio's Dodgeball Club.
Nekketsu Dodgeball Bu i: i-mode
Nekketsu Kōkō! Kunio-kun Online: Windows - Online game developed by Windysoft which began closed beta testing in 2008.
River City Dodge Ball All Stars!!: Windows - Independently published Dodge Ball game developed by Miracle Kidz, a dōjin group formed by Mitsuhiro Yoshida and Hiroyuki Sekimoto, the original game designers of River City Ransom and most of the other Famicom Kunio games.
# The Japanese title is Downtown Dodgeball da yo Zen'in Shūgō!!, "It's Downtown Nekketsu Dodgeball, Assemble Everyone!!"
Kunio-kun no Chō Nekketsu! Daiundōkai: Nintendo DS - A sequel to Downtown Nekketsu Kōshinkyoku currently in development by Arc System Works.
Well there you have it. The full Hotblood series, all rolled into one post :) Taken from Wiki, I edited down the descriptions so that they didn't include the Japanese symbols (for easier reading.)