Hatsuharu can mean a few things.
It can be the New Year (新年)
or Early spring (初春)
It depends on the context or the Kanji used.
It's the month of August.
You meet Hatsuharu in chapter 13 of Fruits Basket.
Fruits Basket is voiced by Funimation. Hatsuharu is voiced by Justin Cook.
His birthday is unknown, but, it is known that his star sign is Cancer.
He is the cow/ox.
Hatsuharu Sohma first appears in Fruits Basket during the school endurance run in volume 3, shortly after new years.
The cast of Hatsuharu musume - 1940 includes: Yumeko Aizome as Akemi, a maid Kiyoko Hirai as Yuriko Naminosuke Horikawa Yutaka Ohara as Ichioka Kan Ueda
Deniva does not mean anything in Japanese.
Didi does not mean anything in Japanese.
Season 1 episode 11
"Olga" is not a Japanese word or name, so it doesn't mean anything at all in Japanese. Did you mean, "What is the name "Olga" translated to in Japanese?"
The cast of Hatsuharu tanuki goten - 1959 includes: Atsuko Kindaichi as Princess No.2 Mieko Kondo as Princess No.1 Tamao Nakamura as Princess No.4 Tony Tani
The name 'Collin' does not mean anything in Japanese, but it can be written in Japanese as: コリン