I was checking out some of the Sun Singers' perks earlier on the website (I have a lvl 3 Warlock) and I noticed that the "equip" button was lit up. I hit it wondering if it would work and it did. I'm not at home so I can't check if it actually worked or not but I thought I should report it just in case it does and I get banned or something.
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No it's fine, you only need one character at level 15 to unlock them all I believe.