Cash Cow Franchise: In its native Japan, the franchise is certainly this for Sega and shows no sign of losing momentum anytime soon. In the ten years since the first game, several sequels, spin-offs and HD remasters have been released, with almost every game becoming best-sellers and falling under Playstation's "The Best" line. A prequel and remake of the first game were released to commemorate the series' ten year anniversary, and the the seventh game in the main series was released recently.
IGN has announced that the Yakuza 6 and Yakuza Kiwami will both be released to the western markets. This comes as a great surprise to fans of the series and it is an appreciated gesture from Konami, who really need to fix their image after the Kojima controversy and all the dirty secrets of the Konami production process that were disclosed. Yakuza Kiwami is a remaster of the original Yakuza game, which will feature the original title, paired with bonus content. The new additions to the game include an extended soundtrack, new cut scenes and completely reworked textures.
Possibly unintentional example. Andre Richardson in 3, who is voiced by Charles Glover, receives an Expy in Ishin named Thomas Glover.
In the live-action film, Goro Majima is portrayed by Goro Ishitani.
Milestone Celebration: In Japan, Yakuza 0 and Kiwami were both marked as 10-year anniversary projects, released in 2015 and early 2016 respectively, with the latter being a Video Game Remake of the original 2005 game. Outside Japan, Yakuza 5 was released on December 8, 2015, ten years from the Japanese release of the original game.
Newbie Boom: Outside Japan, although the series had a solid but niche following, many got their first start when the series jumped onto the PlayStation 3 with Yakuza 3. Following the demand for Yakuza 5, Sega decided to localize and publish Yakuza 0, which became a breakout hit and drew in several new fans to the series. It helps that as a prequel, it serves as an excellent starting point that doesn't require prior knowledge of the story or characters from the previous five games. 0 and Kiwami both became "Playstation Hits" titles, a first for the series.
No Dub for You: With the exception of the first game, which features an English dub with an All-Star Cast, each game since has retained its original Japanese dub. Although many believe Sega had listened to its fans following complaints about the first game's English dub, it was more likely due to budget concerns following disappointing sales. Sega had even expressed an interest in bringing back the English voice cast for Yakuza 3 in the early stages of its localization, with some websites reporting the game would include an English dub, but the idea was quickly axed when they were given a short deadline and had to remove content from the game in order to release it. The idea hasn't been explored in the main games ever since, with the only other games receiving English dubs being spin-offs like Lost Paradise and Judge Eyes/Judgment.
While the main games have all seen Western releases, the same cannot be said about Kenzan! and Black Panther, two spin-off titles (though admittedly the former also had the problematic issue of child prostitution being brought up).
Nagoshi (the director of the series) previously said he would like Ishin! to come stateside. In the same interview, Nagoshi went into detail as to exactly why this trope is in effect: It turns out that the development team that makes the Yakuza games is also the translation and localization team, as they prefer to do everything themselves to make sure they get everything right. The problem is that their team isn't particularly large, and the reason why Yakuza 5 didn't come over is primarily because they had to choose between that or developing Ishin!. Like Kenzan!, SEGA has no plans on exporting Ishin!, though as of writing (21st August 2019), a overseas version of the latter is under consideration.
The Other Darrin: Kiwami saw several voice actor changes due to either the voice actor passing away or from retirement. Key replacements include Shindo's and Terada's voice actor (Tomoyuki Dan and Kenji Nomura) and a majority of the actors in Yakuza Kiwami, most if not all of them were replaced by popular voice actors like Maaya Sakamoto, Tomokazu Sugita, and Toru Okawa. Terada was replaced by Go Shinomiya in Yakuza 2, but Nomura reclaimed the role in Kiwami and Kiwami 2.
Translation Correction: Yakuza 4 was the first game in the series to use the original Japanese names of characters who underwent a Dub Name Change in the localization of the first game. "Shintaro Fuma" became "Shintaro Kazama" again, and while "Kage" became "The Florist" again, he was also referred to as "Kage the Florist" in the fourth and fifth games. The post-Yakuza 5 localization team has set out to undo all the changes, deeming them mistakes. Kage/The Florist becomes "The Florist of Sai" in Kiwami, and the "Sunshine Orphanage" has been reverted back to "Morning Glory" in Yakuza 6. Only to revert back to "Sunshine Orphanage" in Kiwami 2