The Leon Cellular, Gosei Knight's phone, may also sound familiar, particularly since it speaks English and attaches to a gun that can turn into a sword. It shares the voice of Cross Mirage, Teana's gun from StrikerS.
What Could Have Been: The original plan for Goseiger called for there to be more of a rivalry between the different heroes, hence why they were split into different tribes ala Chouseishin Gransazer. The Skyick Tribe (Red and Pink) would have been the idealistic straight heroes, the Landick Tribe (Black and Yellow) would have been closer to Anti Heroes and clashed with the Skyick Tribe a lot, and the Seaick Tribe (Blue) would have either been a Wild Card or a neutral arbitrator. While this was scrapped before the show even started (so the team pretty much gets along from the start), you can catch occasional glimpses of it from the way the characters interact with each other.