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The coolest iridescent add-ons are those that come with a downside.
.except maybe iridescent head...)
I miss the iridescent add-ons that had huge upsides with large downsides. For me, they're the way most iridescent add-ons should be. But Pyramid head, Demogorgon,Deathslinger and Oni are missing add-ons like this and it makes them feel very boring.
(Renjiro's glove showing blood orbs to survivors doesn't count as it... really isn't a downside, the add-on would be disgusting without it)
Iridescent add-ons could once completely change your playstyle and allow you to perform things that the default version of that killer couldn't. They breathe so much replay-ability into the killer and open up so many different strategies to the point that I'm confused as to why the recent killers have been completely lacking.
Please, can we start seeing killers with these kinds of add-ons again? I really miss trying out new ideas for killer playstyles, and Pyramid Head especially has a lot of potential for some interesting add-ons.