I do love TF triggers. :3
I am especially fond of cursed objects or items. Like a cursed horseshoe that gets stuck on your feet and transforms you into a horse. Or even cursed clothing like a collar that transforms the wearer into a doggy.

Stuff like that. X3

Solid TF triggers! good old collar or horseshoe. <3

I love cursed underwear! Especially the athletic kind. Otherwise, perhaps amulets? Or the classic were trigger of the moon. Spells gone awry are also a common one. I've also done transformations based around locations and technology. My wolf did one that was based off a board game that was quite popular. But probably the most popular is a virus based one, where people are physically infecting others!

underwear is hot in general, cursed underwear is a fun idea.

Cursed living latex suits?

Masks & helmets are my favs

There's a lot...
-Cursed clothing (regular clothes or boots, or pawgloves / ear-hats / tail-belt / animal pattern underwear or footwear)
-Costume (furry or latex animal suit)
-body fluid from an other specie (sweat, tears, saliva, semen...whatever. Like saliva or semen from a latex (insert specie) that pounces/kisses the subject)
-spell/curse
-sextoy that remains stuck on the body and tfs the body
-symbiote with its own mind

I pretty much like anything as long as the subject doesn't enjoy the TF and gets embarassed about it, and tries to struggle/Remove what is causing it without success...
I usually think more of a "suiting up" than TF (apart from the spell or curse one).
Like a rubber hollow dildo that encases the wearer into a latex animal suit (or TFs him into one) and he can only paw at his shiny buttocks while his butt is nothing else than an opening welcoming anyone .w.
or trying to remove the pawgloves he was forced to wear and slowly realising they're not gloves anymore, or that the sleeves are now covering completely his arm/shoulder and there's no way to take them off anymore.

hmm yes, I do like all this.

Lasers and wands as well as vats of odd liquids are also fun ways.

vats of odd liquid <3
i like the idea of dipping in vats of ooze!

I happen to like Costumes. Love the idea of literally becoming someone else.

People don't do enough bigfoot art. I like enchanted forest of foot sniffing triggers

can you do a mud trigger ;)

yass, mud TFs!

From the protective cup of a Jockstrap. I have yet to see a TF or costume from a chastity device.

interesting idea!

It's the idea of being changed and the confusion of the human going into the animal itself, embarrassments of others seeing or embarrassment in general during the transformation. After the human becomes the animal it is in, it could be many things at this point
Completely into the thought of what the animal and humanity does not know what it thinks?
A woof woof! After so many protests during the transformation, something like that but not of what I think on it.

TF=
Accidental=going into place they should not have, spiderman esque got bit, or a viral issue, wrong place at wrong time

I have more but I cannot explain at this moment .

I think that is all part of it for sure man!