Xander Winchester

Xander as a half brother or twin

1. Gets adopted by Hunter Caleb whilst age 15/16 & post Acathla or Graduation after meeting during some Sunnydale Cache raiding – Caleb helps him get a better grounding in self defence, supernatural, weapons, first aid... as well as heal from his family & friends abuse & neglect until he finds Caleb body and his Birth dad on the phone.

2. The Gang shunning him after he's forced to kill his possessed step-dad in self defence since despite being possessed he was still human & with a soul – afterwards his big brother Dean comes into town as his emergency contact whilst the gang expect Xander to crawl back to them begging for forgiveness, finds out everything that's happened, thoroughly kicks the Scooby gangs asses and then takes his brother under his wing without John knowledge whilst Sam is at Stanford{side affect could be they stopped in to see Sam & secretly de-possess his friend and put up full protections}

3. Xander bailing on the Gang after realizing at the very least how much they take advantage of him and ends up hunting alone across America until he meets the rest of his family one of three ways 1) at shotgun point in the middle of a hunt, 2) singing & playing guitar on the street, or 3) hitchhiking – side note could be Xander meeting Faith whilst on the Road and once realizing where she's going and the reason why gives a thorough heads up on sunnydale & the gang

4. Xander de-aged by willow to become more of a yes man, gets sent to his unknown to the gang, brother Sam, whilst he's at Stanford and is eventually cured by brotherly love/acceptance, Bobby or Pastor Jim

5. Teen Xander being forced to take care of his suicidal and alcohol addicted [already has issues thanks to the Harris's] half brother Sam after Dean Deal comes due whilst also struggling with keeping Ruby away from them and dealing with a sudden diagnosis of cancer

6. The hospital calling Sam at Stanford saying Xander in a bad way and Sam learning what it truly means to be the big brother whilst Xander heals = could be due to cancer, suicide attempt, returning from hell, bad hunt...etc

7. Xander as Sam twin that was stolen at birth and reunited age 16 after he'd been hunting for two years on the hellmouth & the Acathla incident – ends up going to Stanford with Sam to protect him whilst secretly keeping up with the protections, hunting on the side, working part time in a gunshop, keeping in touch with Dean & Bobby, De-possessing Brady, finding a hunter boyfriend...etc

8. Xander getting legal guardianship of half brother Adam after his mom dies and together with Xander boyfriend whose another trained hunter & Jack O'Neill clone sets out to help stop the Apocalypse whilst working out of their own home base that has enough rooms/beds for them, Dean, Sam, John, & their uncle Clay{loosers}

In each bunny the brothers each have a ring that is warded against being taken off, unwilling teleportation, physical & spiritual possessions, harmful/malicious & shoddy magicks, tracking, impersonation, mental & emotional compulsion/influence & tampering, unwilling magical & psionic bonds...