drifter is genuinely the first "monster" they have added.
every other character is a monster, but friendly. seven is the second closest thing to it, but drifter is a different level of evil and just came to the ritual to slaughter.
his sfx are super horror themed (his ult sounds like you are trapped in hell) and everything else sounds super beastial/gruesome. glad to finally have some just straight up evil monsters that other characters fear.