Hi, the current wordmark was made by Roboartitec. Generally wordmarks are created in Photoshop or similar image editing software. You take the logo of the series, remove the background around it (if it had and wasn't rendered before hand). And then add text trying to imitate the logo with similar font and style. Of course, some knowledge is required, so that you can easily reproduce the style. In our case, the original Nanatsu no Taizai logo also feature "The Seven Deadly Sins" in english text, so Robo also added "Wiki" in similar manner. It depends on the logo, sometimes you just add "Wiki" or in other times you may also want to write the english name yourself if it's just jp text.