Notes:

In one scene of the most recent Helluva Boss episode ("Ghostfuckers"), a demonic spirit torments Blitzo with a vision of forms of Millie if she didn't survive her many near-misses with death.
Golden arrows: C.H.E.R.U.B
Glass, ropes, and gunshots – Murder Family
Busted arm and missing leg – Harvest Moon Festival
Pale and drippy – Spring Broken (presumably eaten by the giant fish monster)
Burned alive – Loo Loo land
Teary-eyed and bloodied – Ghostfuckers (Presumably murdered by Ronaldo)