(Taken from Urban Dictionary)
Nya is simply japanese for meow, while also being fun to use in sentences at random.
Nya is a word they use in Tokyo Mew Mew. あなた can use it when your happy または sad. If あなた get excited あなた could say it. Some people say it instead of hello. Others use it a question. If something makes あなた jump あなた could say it as a reaction. Some say it out of habit.
(Wikipedia)
nya (hiragana にゃあ)
Onomatopoeia The sound a cat makes, meow.
So basically, Nya means Meow. What a cat says. So, now that あなた know, please, dont ask anymore, Nya!
(Yes. I say Nya at school sometimes. School gets boring. Sometimes I try to make school もっと見る interesting!)
Gender: Male
Age: 11
Hair Color: Brown
Eye Color: Brown
Partner: Zubat
Sisters: マリーナ (age 8)
Brothers: 線, レイ (age 15)
Appearance: He wears baggy jeans and a T-shirt . He always wears his お気に入り sneakers.
He keeps his Pokeballs on his belt.
Personality: He is happy and excited new trainer. Sometimes his curiosity gets him into trouble. He is very caring and helpful.
Dream: He just started his journey in Johto and wants to be a Pokemon master.
History: He went off on his journey and soon met a boy named Matt. They became best フレンズ and started to travel together. Prof. Elm asked them to do some research for him in the Kagomo region, which is where they are currently. When Chris gets back to Johto, he will battle his first gym leader.
Friends: ライラック Petal, Amy Rozell, Danny, Ethan
Best friend: Matt