Kiana Kaslana is part of the Kaslana blood line. This blood-line was known for being able to handle Honkai power. Her mother was Cecilia from the Shania family while her father was Siegfried Kaslana. Cecilia was very kind to Theresa (Kiana's aunt according to her) as there were several pages form the manga said that Theresa loved her deeply. Kiana is white haired , a colour which appears from multiple family members from the Kaslana family. She also has blue eyes that turn blue when Kiana becomes a God for the honkai , as seen in one of the cutscenes where she open her orange eyes. this colour choice was probably made to signify "change" given that orange and blue are in huge contrast with each-other. Kiana has many outfit and battle suits. in the manga she is seen with a school uniform which is different from any other one. her "ranger outfit" appears to be the Saint Feria High School uniform while her white comet outfit is her usual battle suit. Divine prayer...
Here is a blog where i talk about one of my favorite game's lore : Honkai Impact 3rd!