#Coh is a horror beyond Anakin's imagination that could kill him if he so desired

[mwolf0epsilon]

If you don’t mind, what is it about Cody’s Bean that Anakin finds off putting?

All Vestiges are off-putting to Anakin.

He can't explain why, he just senses it on an almost instinctive level, to the point where it drives him absolutely crazy that the other Jedi seem unaware of this bizarre sense of Wrongness™ that only he seems to detect in these Very Unusual Beans.

Coh being a Vestige naturally makes Anakin wary of him. Coh being Cody's Vestige adds a new level of discomfort.

Both because the 501st works with the 212th enough that Anakin can't avoid encounters with the little menace, and also because Cody considers Anakin a bit of a nuicense. That is to say, Coh has noted Cody's disdain for Anakin and his unorthodox (and often very stupidly risky) tactics, and taken it as permission to mess with him for shit's and giggles.

Add to that the fact Coh is much more aware than most Vestiges, and especially good at changing his shape in distressing ways, and suddenly you have a very tiny but determined Eldritch Horror hunting the Hero with One Fear in what almost seems like an endless game of cat and mouse.

To Summarize: Coh is an Unknowable Horror™ that only Anakin seems to fully perceive, and what he's seeing is both confusing and scaring him.