Tutétoiles (a self-made portmanteau roughly meaning:
Star Guardians) is what all the Bellangé children have decided to call themselves. Born as human as human can be, despite being of divine bloodlines, they are all aware of their more preternatural gifts. Each child was born bound to their own pocket universe, one that they have agreed to call by a strange name that came to them through dreams:
XSAYA-RSA, or, what they roughly have come to understand to mean
The Rule over Gods. It is an Axis Mundi dimension, meaning, it is a dimension of reality that can influence and be influenced by our own but does not reflect, or sustain, off of any sort of connection. If Xsaya-Rsa collapses, only the children will be affected by the collapse itself. If it is saved, only they are made stronger. This dimension was born of a perfect storm: children meant for great power, born of dream-creatures and passion, with a great curse trying to be broken. All of the power meant to destroy their mother is now inherent in them, and they are made human, but other, for it.
Tutétoiles: magical heroes who grow more powerful as they fight more wickedness and save the day.
While Xsaya-Rsa is hard to explain (a place where each child's birth has created new stars, new planets, new creatures, and great evil rises once in a while and, in defeat, gives the children more powers) the children are their own enigma that requires real explaining. It goes like this: the Bellangé children are, naturally, titanic divine beasts. The complication comes three-fold:
(1) They are chimeric thanks to their paternal bloodline; so, their true forms are strange, conflicting creatures that govern over various concepts and energies. Some of these overlap and each of them was meant to grow stronger based on understanding and inspiration thanks to their maternal self-transcending bloodline. They are immortal wish givers and fantasies, after all, in spite of being titanic monsters as well.
(2) They are made human because the curse should have prevented them from being born at all. Now, the children all exist and register as human, with their Tutétoiles form manifesting only when blood is drawn with malicious intent. Like their father's rage, or Tchernobog's hate, this shift must run out of steam within them before they can revert back to a human form. Outside of blood drawing, however, they were able to learn to harness their own unique particle matter to trigger a shift into varied powerful forms, the way magical girls might.
(3) Their forced humanity triggered a splitting of their beasts, in a way; they now can take on a variety of forms, rather than their true individual creature form. By utilizing their special particle power, they are capable of drawing influence from their domain and summoning a variety of gifts and armaments and, in Sai's unique case: they can summon and create entities whole, with the unabridged power of their Xsaya-Rsa unique particle matter directly. This means they can sometimes look, or even act, like certain mythological creatures more purely than their parents were with being confused for creatures; they actually become varied creatures, sometimes.

Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos. Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos.

Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos. Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos. Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos. Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos. Lorem ipsum dolor sit amet consectetur adipiscing elit. Quisque faucibus ex sapien vitae pellentesque sem placerat. In id cursus mi pretium tellus duis convallis. Tempus leo eu aenean sed diam urna tempor. Pulvinar vivamus fringilla lacus nec metus bibendum egestas. Iaculis massa nisl malesuada lacinia integer nunc posuere. Ut hendrerit semper vel class aptent taciti sociosqu. Ad litora torquent per conubia nostra inceptos himenaeos.