I just received two katanas as a present and I have absolutely no use for them. I was thinking I could make a cool robotics project with them, does anyone have any ideas?

Update your resume: Code Ninja 😆

If they are cheap 420 steel shit, about the only thing you can do is selling them to clueless teens.

How... has "fruit ninja" not crossed your mind.

Throw an apple at your bot and have it slice and dice it mid air.

Someone once bought me a katana, I ended up donating it to a kendo club. It's a glorified poster.
Just pawn it off and use the money to help fund a cool robotics project.

TEENAGE MUTANT NINJA CODE TURTLES
HEROES IN A CMD SHELL TURTLE POWER

We need to make the tmnt theme song the anthem of this planet. One of the best songs in the history of mankind

Katana are pretty bad for self defense in the black-flu-calypse. You really want to avoid splattering blood with all its contaminants around.
So try trading them against some heavy-duty quarterstaves which are pretty versatile and can easily break legs without spilling blood.

The katanas are not the issue.

That your vibe puts out "I would like a katana for a gift" is the issue you should address.