In my classes and clubs, Character Design tends to be a very popular theme. Fantasy characters often have swords, lasers, light sabers, clubs, other weapons, magic amulets, potions, or they may have strange bodily features like fangs or claws or robotic parts. 

I am not opposed to allowing students to share illustrations of this nature. 
It is ok for a drawn or animated character to be holding a weapon IN A NON-THREATENING POSE. Context is key.

HOWEVER.... it is NOT allowed or acceptable to present works showing ACTS of lethal violence or excessive gore. For example: a character can be in a dynamic action pose, throwing a punch or using a shield, but it is NOT okay for a student to present a work that shows a particularly violent attack by one character on another. This can sometimes be a bit of a "gray" area but I want to recognize, here, that DRAWING SKILLS should always be the focus of what we create and share, rather than expressions of violence or excessive gore.

It is VERY important that my class members exhibit respect and sensitivity to one another. What might be "cool" to one could potentially be an upsetting emotional trigger to another person. We do not want to create an upsetting environment. 
We're here to have fun, be creative, be social, and get better and better at drawing.
If ever a learner is upset by any presentations, I beg that they reach out to  me privately so that I know as soon as possible.