"Harvest Angel of Wisdom", "Layard the Liberator", "Meltiel, Sage of the Sky" and "Voltanis the Adjudicator" all appear as characters in Yu-Gi-Oh! World Championship 2008, and "Bountiful Artemis" appears in Yu-Gi-Oh! 5D's World Championship 2011: Over the Nexus.
All members shares elements in their designs like bodies made of crystals encased in robotic armor, while following a Greco-Roman mythology name/design pattern.
Something to be noted is how they seem to be divided in two art styles despite having the aforementioned elements and being part of the same series - some members seem to possess a more humanoid appearance like "Meltiel, Sage of the Sky", while others have more mechanical designs, such as disjointed arms/hands, a face adorned with lines, and a single metallic dot (that could serve has the monster's eye), also they reveal less of their crystalline bodies, making them look a lot like "Banisher of the Radiance", "Radiant Jeral", "Royal Knight", the Herald series, and the Majestic Mech series (specially "Majestic Mech - Senku"), like "Bountiful Artemis".
On their own, the Counter Fairies do not synergize well, but work to support other Fairy archetypes. Their support effects trigger when a Counter Trap successfully activates and/or resolves, and either destroy cards on the field or replenish the player's hand, maintaining card advantage.
With the introduction of "Guiding Ariadne", Counter Fairies have gained the ability to use any Counter Trap for no cost, due to "Ariadne's" Pendulum Effect. Because of this, even if the player's LP or hand are low, they can still use cards such as "Cursed Seal of the Forbidden Spell" or the Solemn traps without putting themselves at more of a disadvantage.