Frisk should have a kinder voice than Chara. Frisk is a Gender-neutral child so they can have any gender of voice. You do not have to be a professional or change your voice for this character. Just be yourself ;) After Asriel died, his dust spread to one of the golden flowers in his father's garden. The royal scientist, not knowing this flower contained Asriel's dust, injected it with determination. Determination is the will to live. Asriel was reborn into the flower, not able to feel emotions due to the lack of a soul. Asriel, now known as Flowey, has become a total 'monster' to the timeline and is a Fallen angel. Frisk tries to save them with their Determination.