One of my favorite things about Xander is the way he just keeps adopting people. Xander tries to be stand offish but then he sees someone a bit childish and immediately adopts them. Besides his own siblings, he also picks up Peri, Laslow (in the beginning of their relationship), Veronica in Heroes, and Takumi in Warriors.
If you haven't seen the Takumi and Xander support in Warriors, definitely look it up. It is really interesting to see how Takumi responds to Xander's approach to getting him to not over train himself versus Ryoma's approach to getting him to not over train himself.
HE'S A BIG BROTHER AT HEART!!! and in every other way ghdjfsjb i think abt how he just started hanging out with veronica in heroes all the time. and that support with takumi was sweet!!! of course it was about training, these dopes. something i rly like abt xander is how readily he'll talk abt his failures sometimes--in a way that he recognizes they helped pave the path leading to where he is now. and relaying those failures to others to try and help (in this case, to takumi) is just. SO big brother of him. ;w; onii-san!!!!