The original Echidna tag is the character from Queen's Blade, but there's a lot of possible different meanings to the world Echidna, such as other characters and species named Echidna, or based on the greek myth of Echidna, and there's also the real life animal Echidna which Knuckles is based. I believe it would be more efficient if there was a disambiguation for this case, having so many characters named Echidna... while the character from Queen's Blade could be changed to Echidna (Queen's Blade).