The Murderous Apprentice 

Mentions of murder and possession.

All pronouns are optional and completely changeable. 

You play the child of a wizard, warlock, sorcerer or witch.

Your parent is recently dead.

One of your father's apprentices has custody of you until you turn eighteen in a few months/next year.

He doesn't know you saw him kill your father.

Once you've reached majority you can put him to trial.

But do you want to?

He was always friendly and kind towards you and you know he respected your parent a great deal.

So why would he do it?

What you don't know is that your parent was possessed.

Try to figure out what happened and especially why.

Possibly gain clues to unlock flashback or bonus POV scenes.

--

Alternative idea: your parent had several apprentices. 

Pick one as your guardian.

Hope that's not the murderer.

Each apprentice would have a different reason for killing their teacher.

The friendly one is secretly a spy, sent by rival mages or your enemies of your parent's potential patron.

The taciturn, reserved one did it because parent was possessed by something evil/a demon.

Because this one's ambitious and often unfriendly, he is the first suspect.

The easygoing one did it because they were too lazy in their, and w

ere going to get kicked out by your parent.