Eight characters: Xin Mao, Ji Hai, Gui Si and Xin You.
Eight characters and five elements: 1 wood 1 fire 1 soil 3 gold 2 water.
The sun is dry and aquatic in winter, so there must be fire to help you. You prefer water, but you should avoid gold.
There must be fire in the five elements, and water is fun. Suggested names are: Liu, Liu Hongyu, Liu Haolan, Liu Qingqiu, Liu Yingqiu and Liu Zixuan.