I imagine Xander with a friendly late teens voice, more on the higher pitched side. Even though he is part android, he does NOT have a robotic edge to his voice.

Xander is part human part android, having two limbs and his eyes replaced for mechanical parts due to an accident he barely has any recollection of. The visor over his eyes is actually built in, and is just a screen. If the visor breaks he has no way to actually see anything, but luckily it is very sturdy. The yellow eyes appear when the screen is turned on by a signal in his brain when he is awake, and when he sleeps the screen shuts off and goes black. Xander gets flustered pretty easily, and tries his best to be seen as a good addition. He has a kind heart and cares about his team.