(Or Caeda if you prefer, I'm European so it's Shiida here!)

I would rather you go for something like her OAV voice, more tomboyish, rather than the sweeter voice she has in Heroes/Warriros. 

Shiida is portrayed as a kind, patient and a forgiving yet headstrong and stubborn individual, a fact that is evident through her interactions with various characters. Her base conversations with the Avatar, for one, sees her patiently guiding them in the art of cooking, choosing to tactfully console them instead of chastising them when they display a disastrous ineptness in making candy. These traits of Shiida's are ones that extend towards her being able to overlook a given person's past and grant them chances to make repatriations. Shiida's relationship with Ogma best illustrates this point, as she, in spite of her reservations over his past life as a barbaric gladiator with an unquenchable thirst for mindless, meaningless battle, chooses to grant him a second chance at life by knighting him as one of her personal guards. When the situation mandates a need for Shiida to be serious however, she can be gravely so, a fact that sees her risking her safety in many a battlefield in order to seek reinforcements to turn the tide of battle in her favour, as is the case when she escapes her home castle in Talys during a Galder Pirate invasion. Bolstering her battlefield tactics, Shiida has been portrayed to be extremely perceptive and to possess a sharp memory.