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Frisk: Half full.
Flowey: Half empty.
Toriel: Her experiences say half empty, but she wants to believe it's half full.
Sans: Can't decide. He wants to believe it's half full, but his mind is more compelled to think half empty. He flips it upside down. Doesn't help much. Is it full? Empty? Someone please help him... Sleeps.
Papyrus: The glass isn't just half full, it's overflowing! It's flooding! The room is an ocean! The underground is an ocean! The world is nothing but water! Oh god, what have you done?!
Undyne: Half full. Anime says so.
Alphys: Half empty. Other anime says so.
Mettaton: HE IS THE GLASS.
Napstablook: They cried so much the glass filled up anyway. Please don't drink it.
Asgore: Drinks the water. Now it's empty. He has nothing left.
Chara: Fills the glass to the brim. It's more efficient that way. =)