These could all be legitimate people, but they all happened to be online, and all happened to coordinate an attack within 2-3 minutes of each other, in such a way that the first ones hit me with containment and disarming, the second hit my traps, and the third and fourth went for me directly.

ATeddyBear
ACuddlyKitten
ABabySeal

And the cake topper, the only one I know is a real person... A Fluffy Bunny

So did I get hit by my kid's entire toy chest, or are these just guys having fun with their names, or are they multis of the higher ranked Fluffy Bunny?

Many players in ROO personally requested name changes to various woodland creatures.

Seriously, if you truly suspect a multi, use the existing in-game report link.