Alright here's some of my Ideas
Necrotic Knife - Deals about 15ish damage, upon killing a Human, would spawn a zombie with 50 Health, zombies attack with melee claws
Damnation Curse - Same thing as a Necrotic knife, but this is a Curse, which all humans killed inside would turn into Zombies.
Insanity Curse/Spell - In the Curse version Friendly Fire is enabled on all humans inside, and one of their Number would start fireing his weapon like Mousefire(1); while turning around randomly, in the Spell version it would work just like the Curse, only you would know that the person you hit would be the Insane one.
Shadowy Explosion (Something like that) Passive curse/spell - When you die, you explode into a blast of shadows which blind nearby humans, possibly push them back a little
Voodoo Knife - About 5-15ish Damage. When you hit somebody, for about am Minute you can swing the knife again (From a Distance, or you can them again and deal the damage of the knife + the Effect) You deal 1-5 Damage and make them move a little bit in a Random Direction.
Douser passive spell - Halves all incoming Lava and Flamethrower Damage. Possibly making you immune to flamethrower when Crouched. Also prevents Flamethrower from Stacking Flame hits
Bloody Knife - deals 5 Damage to start, and +5 Damage each time you hit the Same person.
Jynx curse - Makes it impossible for weapons to be Equipped while you are inside it, looks like a Blue bubble cloud from the LoZ series.
Cursed Knife - Prevents healing for 10 Secounds when you are hit by it, about 5-15 Damage for this one.
Vampyric Knife - an Additional Quarter/half of all damage dealt is turned into HP
Ghost activate-able Passive - For 30 seconds Stalker isn't able to damage, or be damaged, also passes through Players
Undying Passive - Acts like a Dead Ringer.
Reduction Passive/Curse - Curse version reduces all damage dealt to Stalkers in cloud, Passive spell could be activated for 30 seconds to reduce Incoming Damage
Toxic knife - Deals 3 damage, and 1 damage a second for a Minute.
Forms, possibly would be Passive spells
Crawler Stalker - Has a total of about 50 ish Hp, but can wallclimb looks sort of hunched over.
Flying Stalker - has 50-70 HP, can fly, looks like Crawler stalker with Wings
Large Stalker - Slower but has a Damage reduction of about 10 ish, and has a total of 150 Hp, possibly restricted to using a Large Sword or Club.
That's about all I can come up with for now.
Edit: two new knives
Chaos Knife - Deals 5-40 Damage total, doesn't backstab, and moves the Human stabbed with it in a random direction for 5 secounds.
Leech knife - Looks actually like Claws, when a Stalker backstabs a human with it, they climb on their back and slowly steals their health, sort of like a Jockey, the Human is unable to remove the Stalker themselves, Doesn't deal any damage except for Backstabs.
Poll