Live2D should be fine, just try to avoid anything that would significantly alter the pose. Head shifts/turns, eye movement, tils and such of body parts are fine, but if you need to replace body parts(e.g, swapping arms) in order to create a pose you wish to use, it would likely violate the one asset rule.
Use your best judgement on non-human characters. I won't likely be overly critical as long as the spirit of the jam was attempted.