I know that a lot of people are really disappointed with Ophiuchus since the moment she's summoned is to immediately get one-shot by Kagura, and then literally never seen again. She's also in the Eclipse Spirit filler as well, but we'll ignore that for now...

So since we never actually learned anything about her, (Seriously her wiki page is 80% made up just describing what she looks like) that leaves it up to fan-theories to explain, so whats yours?

In particular;

• 1) Why is her key black?

• 2) Do you think theres a reason Yukino hasn't summoned her again?

• 3) What kind of power do you think she actually uses in the event she's actually allowed to fight?

In case you're wondering my own personal interpretation: 1) Rebelled against CSK and attempted to "kill" her own key. The key itself ends up poisoning any people that try to use it. 2) Yukino gave the Key to the Kingdom when she became a knight, and didn't trust herself to ask for it back after Eclipse was shut. 3) Combat Medic. She's large and robotic enough that she doesn't need magic to fight; instead, keeping with the medical theme she has access to healing magic, just with enough power to heal fatal wounds mid-fight. Assuming she doesn't get immediately sliced in half of course