Hmm... I think I'll answer this in three parts: physically, mentally, and emotionally. Physically, Flicker is not very strong, and he's very small, even by nerdy fox standards. The poor guy is liable to just get overtaken by anyone fast enough to outpace him and strong enough to lift him up. He can project electricity from his paws, but it leaves him weakened and isn't strong enough to subdue anyone committed to catching up with him.

Emotionally, Flicker becomes overwhelmed and overstimulated easily. If you ask him to do multiple tasks or interrupt those tasks, he will find it difficult to get back on track. He's easily distracted by something piquing his interest, and he tends to shoot around like a bolt of lightning on different tangents. Making loud noises when he's trying to concentrate or getting him to feel multiple sensations at once are surefire ways to fry his brain.

Emotionally, Flicker's a sucker for anyone calling him cute, or adorable, or any variation thereof (cute little fox is his favourite though). If you approach him and point out his small stature or call him or any of his features cute, he's liable to get flustered and shut down. He also really likes it when you massage his ears or rump, and of course when you pick him up and cuddle him. He likes to be snippy and sarcastic, but he's actually a little softie that loves being cared for (very much an adult though).

And of course, EMPs.