The main characters in this crossover are: Astrid Hofferson, Merida, Rapunzel, and Toothiana. The idea was most likely conceived when the Big Four first came out. This friendship crossover started before Frozen was released in 2013. Elsa and Anna weren't present at this time. Even though this crossover wasn't as popular as the original Big Four, it still have some supporters. Some fans wanted to add Astrid and Tooth to the group because they weren't included to the group. Astrid and Tooth were often left out.
The unofficial leader of the group. Merida's balance between fighting knowledge, survival skills and royal education, Merida holds a strong set of skills necessary to lead a country in her adulthood, much less the other three.
The military strategist and second-in-command. While Merida is known for her temper and fighting prowess, she is held back by her culture's male-centric ideology (not to mention her traditionalist mother). Astrid however is a shield-maiden that has lived in a culture steeped in battle and glory, encouraging her to train in combat, giving Astrid skills that could be effective against anyone, human or dragon. Should she never marry Hiccup, Astrid is considered the only non-royal of the four.
The oldest and most magical of the group, as well as the surrogate mother figure to the other three. Toothiana is considerably older than Jack by an undetermined amount of time, giving her a much broader level of experience and knowledge, whether it is in battle, politics or even ancient magics.