Daisuke (black hair with the part in the middle) and Hiroshi (shaggy light brown hair) are best friends, and some of Ranma's only admitted male friends.
Even though they often cheer Ranma on, they frequently comment to each other at how tired they are of Ranma always getting the attention of all the girls.
In the beginning they (along with most of the male students at Furinkan) seemed to like Akane. Later they demanded that Ranma tell them who the Pigtailed Girl was and what his relationship with her was. Daisuke and Hiroshi can best be compared to Ranma as Megane, Chibi, Perm and Kakugari are to Ataru Moroboshi in Urusei Yatsura or Sakamoto and Kobayashi are to Yusaku Godai in Maison Ikkoku, in that they are minor characters that make up the group of friends to the main male characters.
The Meaning Behind the Name - 大介 & ひろし
Daisuke (大介) can mean "brotherly affection" plus "assistance".
Hiroshi (ひろし) has a few meanings. "Remain peacful, expansive, abundant, ambition, or great soldier." These two were probably given these names not because of puns or for any humorous reason, but to show they are just average characters. Both names are fairly common Japanese names. In the Ranma ½ Memorial Artbook Hiroshi is given the monier "Chapatsu" (茶髪) which is a reference to his hair color (tea-colored would be the translation).
Voices:
Takehito Koyasu
The stylish Takehito Koyasu has played bigger roles than just Ranma's sidekick, Daisuke. He's also voiced Hotohori in Fushigi Yuugi, Zechs Merquis in Gundam Wing and Aya Fujimiya in Weiss Kreuz.
David Kaye
David Kaye is one of the most frequently heard voices in English anime work. Besides
Ranma ½'s Soun Tendo he is also
Gundam Wing's Treize Kushrinada, Kim Kaphwan in
Fatal Fury, Master in
Maison Ikkoku and Sesshomaru in
Inuyasha.
Voices:
Koji Tsujitani
Koji Tsujitani is another heavy hitter, but you would not guess it from his small role on
Ranma ½. He replaced Hirotaka Suzuoki after his death as Tatewaki Kuno in the Nightmare! Insense of Spring Sleep OVA. His roles include Miroku in
Inuyasha, Yakumo Fuji in
3x3 Eyes, Kubo in
Otaku no Video, Ryu in
Street Fighter II V and Bernie in
Gundam 0080. He was married to Kumiko Wantanabe (who plays Shippo in
Inuyasha) before his death.
Terry Klassen
Terry Klassen is another frequently heard voice in the English language industry. His previous roles include
Maison Ikkoku's Sakamoto, Dragonball Z's Krillin, and Hatchie in
Inuyasha.