Six years after the Dragon Gem broke, Raya comes to the end of a stream in a shipwreck where Sisu is most likely to be found. She is shown to be optimistic and steadfastly holding on to hope for the future or for a greater outcome regardless of the situation even, and stated by Raya as Hopeful. A pure heart, she is forgiving, unable to hold a grudge towards anyone, even befriending Namaari after being revived by her siblings along with the rest of her kind, even though she accidentally killed her prior. She is loyal and open-minded, willing to give someone the benefit of the doubt for a chance to redeem themselves. She's brave, shown when she fearlessly fights the Fang armies' to defend Raya as well as approaching Namaari holding a weapon. Although she is quirky, she is wise and intuitive, and able to give sound advice when required. That is to say that she is much more trusting of others. However, the latter is her strong suit as she retains her belief that one can be trusted through cohesion and unity. She is shown to be somewhat naive as she does not understand the current human customs such as credit, hot sauce and thinks that most things can be solved with getting someone a gift. While she is a bit of a goofball, she still is able to recognize when something is of serious consequence and will drop everything to help. Sisu is a kind and fun-loving dragon who loves making wisecracks and speaks in slang. She wears grey colored trousers that stop below the knees and blue soft shoes that reveal her ankles. She wears a blue, long sleeved robe with a design pattern on it and a white furry collar. She retains her purple eyes, but now has goofy looking teeth.
In her human form, Sisu resembles a young Southeastern Asian woman with long messy white-bluish-violet hair. She has two horns at the top of her head, patterned with an intricate design. She has two dark blue horns with swirls on top of her head and has a snout with sharp teeth. She has short dorsal fins on her back and possesses white-bluish-violet hair as a mane and a small tuft of her at the end of her tail. She is blue in color with a darker shade on her back and a lighter shade on her stomach, arms, and face.