What I mean is a heart to heart like Ven/Sora, Terra/Riku, Aqua/Kairi. 'Cause Sora has shown to have a similar personality to Ven when he got older. Same goes Riku and Kairi. Also what happens or at least what did happen to them is similar. Both Ven and Sora lost their hearts, both Terra and Riku lost themselves to darkness, in turn losing their body to Xehanort, and both Aqua and Kairi got lost in darkness (Aqua more trapped in the Realm of Darkness but pretty close).