My personal ranking of how scary each leviathan is ;

[Lara "Chara" (She/Her)]

#1 : Ghost Leviathan (Words cannot describe the fear I feel when I hear that "Entering Ecological Deadzone)

#2 : Reaper Leviathan (Personally, I think it's overrated. Still scary when it grabs you.)

#3 : Ghost Leviathan Juvenile (Ghostie but smol)

#4 : Sea Dragon (Big derpy lizard, still makes me panic when he slaps my Cyclops around.)

#5 : Sea Emperor (spooky telepathy, but actually just a tired mom.)

#6 : Reefback (kinda spooky when it looms over you and makes it noises.)

#7 : Sea Treader (cutie patootie)

[Justice]

Reaper is just loud, jump scare while Ghost Leviathan is haunting and envoke terror.

Whenever I hear Ghost Leviathan attack some fishes with pierching screech in a distance - I always assumed he spoted me and rushing straight at me. Hard to tell sometimes if it's true or not.