A new scan from Jump introduces two new characters for Tales of Berseria, Teresa and Oscar. These two are the ones we've been seeing in the trailers.
Teresa Linares ( テレサ·リナレス, teresa linaresu, romanization not yet official)
Voiced by: Yui Horie
"This is to maintain order. Those are the regulations of the Abbey, am I wrong?"
- A cool-headed first-class Exorcist. She is a very gentle person to her half-brother, Oscar.
Oscar Dragonia ( オスカー·ドラゴニア, osukaa doragonia, romanization not yet official)
Voiced by: Tomoaki Maeno
"Don't think badly of me, but I don't hold back against powerful daemons like you!"
- A first-class Exorcist born from a noble family. He has a strong sense of duty for his mission to eradicate the daemons and hinders Velvet repeatedly during her journey.
The two are introduced as half-siblings. From their last names, it seems that they probably have different fathers and share the same mother. It's also not mentioned if they're playable, but from what we've seen in the trailers so far, they're probably NPCs. But we'll see.
It seems Laphicet is initially with them. As we mentioned before, Malaks are beings used by the Abbey as their weapons of sorts. In one of the screens, Teresa calls Laphicet as "Number Two."
The scan also mentions Mystic Artes a bit, showing Velvet's. The scan's too small, but it seems Velvet's Mystic Arte is called Lethal Pain ( リーサル・ペイン, riisaru pein).
Scan from @kazu4281 via Twitter.