Mika'el

His true name can only be scribed in demonic glyphs the like a common pen cannot produce, but best translated to modern tongue, his name would be rendered: Mika’el. One of Hell’s many pestering imps, Mika’el is spewed from the pit to perform his vile duty of sowing madness in the world of men. He is seldom seen, but always heard.
His favored haunt is a bathroom. Should the bathroom door be left ajar, he will slip inside unseen and begin to hum a fiendish tune; not one of notes and rhythm, but a discordant cacophony of piercing noise. The door will become sealed with black magic and will refuse opening until the creature grows weary, typically in one or two hours, but as long as eight has been rumored. When the spell releases, Mika’el will have disappeared, leaving only the stench of brimstone behind.
A kitchen is where he takes secondary delight, from which you may hear mutterings in a stygian tongue spoken with a soul-shuddering voice. You will find too that unwatched food will vanish if it leaves sight even for a moment and a roaring belch bellowed from an unlit corner will soon follow.
When Mika’el manifests, he lingers only at the edge of one’s vision, for no matter how strong your will, your eyes will refuse direct gaze. The few who claim memory of Mika’el’s form describe him as such: He is a tall figure with a dimwitted visage, pallid green skin, and matts of manged hair. He has also been described to radiate a childlike aura, though be not deceived by this; he is of the Maw.
Should he darken your dwelling, take ease that his presence is by chance, not curse or wrongdoing. So too will he someday depart by chance, should you decide to endure him, though should you leave, he cannot follow.