Jon Silvercloud
If it's below the ground or beyond the treeline at Xavier's it's Forge's domain. While Scott has taken over duties as the field leader of the X-Men that doesn't mean Jon isn't still the drill sergeant everybody loves and loves to avoid. The salty Native runs the sub-levels and tinkers while he keeps the techies (Eden!) on task. If he's not downstairs he's outside, if he's outside he probably wants to be alone.