Finding out that the number 666 is mathematically triangular (a "Step Squad" in Numberland-lingo) gave me a creepy idea: Block #666 as an archvillain, with his stairstep arrangememt turned to face the opposite of the good guys'. He'd wear a scarlet mask with horns, have glowing yellow eyes, and hold a fire-spitting pitchfork in his left hand. Definitely a "fan fiction only" character, since the programming censors at CBeebies would never allow symbolism this spooky and/or blasphemous on a kids' show!

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