Wouldn't Solar and Anubis technically be brothers? Since Solar is just Iblis reincarnated and Anubis is Mephiles.
I can see where your coming from! But no.
Anubis and Solar's consciousness are completely separated from Iblis and Mephiles'. It is more-so their powers being trapped within these kids' bodies, rather than them being the kids; unlike with Roxanne whom is the reincarnation of Light Gaia.
After the main events of the Sol Empire. Iblis' mind gets trapped within the Sol Emeralds and the powers from Iblis stay within Solar. Anubis has DNA from Mephiles (and Infinite but that is not important in answering your ask) and therefore has acted as a host to contain his mind and soul, much like the Sol Emeralds have done to Iblis. They do stay stuck together, but they are not the same.
There is definitely a possibility to draw Mephiles and Iblis' mind and powers out of Anubis and Solar; and the Sol Emeralds to reform Solaris as a whole! But as stated above, Solar and Anubis are two very separate characters with their own lives, thoughts, wants and needs. Who have had Iblis and Mephiles guiding them, even if said guiding hasn't been the most positive, to enhance their own desires.
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