Annabelle! Because the way Annabelle is slowly becoming, with how calm she is finally getting to be and getting into her true nature, I really think that the two work well together like that. Him with his sporadic, energetic nature and her with her calm and just generally happier. There doesn’t have to be any words spoken, and Anna knows that she loves Syx and knows that he loves her in return. With him, she can be who she truly is, and with her, he can be the same <3