Is this beast Pikachu sized? If so, then your boast might be true!
Seriously, though, I think killing any animal who weighs close to my weight would be difficult if the animal were, say, attacking me and I were only allowed to kick to defend myself.
But what are the "rules" here? For example, if there were a sleeping 200 pound, 6 foot man, it might not be too hard to sneak up and manage a sudden kick/stamp to his neck, crushing his windpipe.
And if one is allowed the use of
sedative pills or darts beforehand, then killing most animals, human or non-human, might be fairly easy...as long as the animal has an obvious neck to kick in and block air flow.
I think kicking a shark to death, which I wouldn't want to do anyway, would be very difficult. And any large, feline predator would out-maneuver a human quite quickly and lethally, long before you manage to give a lethal kick. Anyone who thinks he or she can kick a mountain lion to death is going to have a rude awakening.
How to Survive a Mountain Lion Attack | RailRiders Adventure & Travel Blog