/shrug
I've no idea what character I'll make (I need to see the character system first), but the vast majority of Oblivion characters I've made have ended up as Sword-and-Shield sneaky archer mages.
i.e, sneaky, with just enough archery to open a fight with sneak attack, just enough magic to support with healing/telekinesis/soul trap/etc, and most combat done with sword/shield/light armor
I'll admit that I've never made a "tank" type, though. (Sword + shield + heavy armor). Heavy armor was always too heavy and slow.