Apollo Justice: Ace Attorney, released in Japan as Gyakuten Saiban 4 (t]ٔ 4, Gyakuten Saiban 4 lit. "Turnabout Trial 4"), is a visual novel video game for the Nintendo DS. It is the fourth video game in the Ace Attorney series.
Apollo Justice: Ace Attorney is the first game in the series to be developed specifically for the DS as opposed to being a port of a game originally for the Game Boy Advance. As such, many of the techniques utilizing the DS touch screen and microphone features that were employed in the fifth case created specifically for the DS port of the first Ace Attorney video game are a fundamental part of Apollo Justice. Additionally, the graphics are notably improved and polished compared the original Ace Attorney, while still remaining similar.
Apollo Justice: Ace Attorney (which takes place chronologically seven years after Phoenix Wright: Ace Attorney - Trials and Tribulations) will be the first game in the series that will not feature Phoenix Wright as the main protagonist, though it won't be the first time a different attorney will be playable. The game takes place in what seems to be a mock of Los Angeles. A limited edition of the game was made available for the Japanese release on April 12, 2007. It includes branded headphones, a Gyakuten Saiban Dictionary on a DS card, and a series highlights DVD.
Informations takes from wikipedia.

Name:Apollo Justice / Housuke Odoroki D@
Age: 22
Gender: Male
Occupation: Defense Attorney
The new protagonist of the series, he is a young attorney with "a passionate heart burning red." He is 22 years old and can point out lies by examining body language by using the Perceive system.
Personality: Apollo is a lively, passionate young man, but as he's just starting out he's also eager to look to others for guidance. Can be considered easily flustered, but at his core he's a lot like a young Phoenix.
Friends and Family: Pupil of the famous Defense Attorney Kristoph Gavin. (spoiler)->Son of Thalassa Garmarye, and Trucy's half-brother.?His father is presumed dead (identity unknown). <-
Misc Facts: He was almost named Ikinari (ikinari = "all of a sudden").
Apollo's hair "antennae" are not naturally occurring. Character artists Nuri says he has to carefully gel them that way every morning.
Writer Takumi had wanted Apollo to wear green, but was overruled by the rest of the team.
Apollo doesn't like heights or loud music.
Apollo's bracelet allows him to use the "Perceive System," a kind of extra concentration that lets him see a person's nervous habits.
Name Origin:
English/French/German: In Greek mythology Apollo is a god of light and truth (and may also refer back to Phoenix being named after a mythological creature). Justice is just a very blatant reference to his profession.
Japanese: Odoroki literally means "a surprise". The kanji hou means "law", and suke is simply a common ending for boys' names.? So, his first name basically means "law boy."
The creators had some trouble coming up with Kanji to go with Odoroki (they came up with "king" "mud" and "happiness").
Background: After having completed law school, Apollo joined the Gavin & Co. Law offices, where he studied under defense attorney Kristoph Gavin. When Gavin goes in jail he start to be a part of the Wright and co. Talent agency, where Trucy and Phoenix help him to find new cases.(spoiler)-> No details about his life before that time are known.? His mother Thalassa was married to his father for only a year before he died, and what become of Apollo after she remarried is not known. <-
Informations take from wikipedia and Court Records.
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