Easily the most successful member of the five main Goseigers, Chiba later starred in a lot of movies and TV shows. Notable ones include: Ouran High School Host Club, Ao Haru Ride, Mr. Maxman, and the upcoming Kurosaki-kun no Iinari ni Nante Naranai, all of which he played as one of the main or secondary characters in the said movie or TV show.
October 2011, months after the release of Gokaiger - Goseiger - Super Sentai 199 Hero Great Battle film, her blog disappeared and her name was removed from her talent agency's official website. The only thing that is clear at that time was that she's not anymore affiliated with Platinum Production, her talent agency.
After that, no news about any new work was announced to the public. Apparently, there is a big scandal involving a few people of her agency, a man she used to work with, and for some reason, the mafia was involved, causing her to lie low for a bit. On Mikiho Niwa's March 2015 blog post, we learned that she still hangs out with Rika Satou who now enjoys a quiet and ordinary life.
After Goseiger, Hamao did a couple of movies and stage plays before announcing his retirement back in October 2013. The reason why he decided to retire from show business is to focus on his studies and hopes to fulfill his dream of becoming a lawyer. Even though he made the announcement in October, he didn't retire until after the release of his final film, Taekwondo Damashii: Rebirth. He retired from show business on February 2014.
After the end of Super Sentai 199 Great Hero Battle movie, she eventually became part of a cheerleading film titled "Cheerfu11y". The film premiered back in October 22, 2011. These days, she's a host of NTV's ZIP! morning show and was a weather girl for the said program, and got eventually promoted as one of the show's regular hosts.
Back in January 2014, Ono left his talent agency, Stardust Productions and placed his activities on hold for that time period. These days, it seems that he is more active on theatre as he is part of the recent Seraph of the End musical and the upcoming Fairy Tail stage play.
He is still an active voice actor and some of his work post Goseiger are: Beelzebub's Tatsumaki Oga, Shakugan no Shana III's Merihim/Shiro, Danganronpa: The Animation's Daiya Ōwada, Akame ga Kill!'s Bulat, and One-Punch Man's Tank Top Master.
[Additional sources: JEFusion, Henshin Justice, Tokusatsu Network, Wikipedia (link 2)]