As the title suggests, the Misfit Toys Sidekick is capable of hitting friendly targets with either a select few or a single attack. The attack in particular that I ended up receiving was a Meltdown from one of the non-Commander toys.
Aspasia's Misfit Toy deals 16 (261) Particle Damage to you with Meltdown.
This is particularly problematic as the Meltdown power is also a Knock Down, and as knocks infamously can't be guaranteed blocked, this can cause this sidekick to end up knocking a player out of their Block. Such happened to me at a run of Teleiosaurus while I was blocking Radiation Breath, causing me to be knocked over, block disrupted, consequently ending up with two stacks of the debuff for not blocking it.
I am not the only one this has happened to, and subsequently they tried to replicate it in a controlled environment to no avail. This seems to need a very specific toy to be spawned by the Commander and we've no means of controlling said spawn. Regardless, this can cause issues down the road, and should be promptly fixed.