What if she were siblings or related to Biana and Fitz or the Dizznees. I will just put a scene down for each charachter who could be her sibling.
Dizznees: 1. They meet and instantly get along.
2. Dex is willing to fix things for her.
3. Dex doesn't think her eyes are weird.
4. Dex gets gross food and Sophie copies him then he has to go to detention.
5. Dex doesn't like Fitz crushing on Sophie.
6. Dex could have mistaken his brotherly love as a crush and told everyone but people who knew didn't correct him.
7. Dex starts having a crush on her but in reality it was just his brotherly love kicking in and states that she looks good like Biana and that Biana might be jealous.
8. Sophie and Dex decide to be teammates for Splotching. He thinks she can't beat him but little does he know. He also probably wanted to be near her if they are siblings.
9. Dex liked it when Sophie beat Fitz probably because he was glad for his sister winning.
10. Dex stays away from Fitz and Biana even if they are his maybe sisters friend.
11. Dex is the first and only alchemist she goes to for lessons and he was willing to help her probably because they are related either biologically or it could be his cousin instincts kicking in.
12. Dex tutors Sophie for free.
13. Dex tells Sophie to relax and that she will do fine with her exams possibly to be a supportive brother/cousin.
14. Stina makes fun of Dex and Sophie defends him possibly her sister instincts kicking in.
15. Dex would organize a protest if she failed possibly hinting at him being her brother.
16. Sophie wants to hug him after the Midterms gifts of there's were given to each other possibly showing that they are siblings.
17. Sophie changes the subject for Dex when he seems uncomfortable with Keefe's teasing possibly hinting that they are siblings.
18. Sophie hugged Dex when she passed Alchemy possibly showing that they are siblings again.
19. Dex gets close to her while searching for stars possibly trying to protect her.
20. They had to rely on each other to help the other out when they were kidnapped. She needed to save Dex from fading.
Exile:
1. Dex holds her hands as they walk towards Alden's tree possibly him comforting her as a brother.
2 and 3. These don't really count.
4. Dex writes about how he misses her in a notebook and she said she also missed him probably in a sibling way.
5. Dex really doesn't like Keefe flirting with Sophie probably because they are siblings again.
6. Grady asks about Dex possibly because he knew that they were related.
7. Dex wants to go with Sophie to see Terik probably expressing that he wants to see her potential and that they are siblings.
8. Dex sits next to Sophie even though she smells bad probably because they are siblings again.
9. Dex feels safe only around Sophie probably exhibiting that he is the younger brother.
10. Sophie cares about Dex.
11. They hold hands in front of their Wanderlings possibly because they feel safer with their sibling.
12. Dex didn't want to leave her alone with Wylie even though he does leave possibly showing that they are siblings again.
13. Dex was against the Vackers but came around for Sophie possibly showcasing that they are siblings.
14. Dex thinks he is jealous of Keefe going to Sophie's house alot but isn't really because they are siblings possibly.
15. Dex is ok with Sophie telling her other friends that he is an Technopath possibly because he is her brother.
16. Dex helps get a message from the cave even if he has to rember those horrible days because he is related to Sophie and willing to do anything for her.
17. Everblaze; Dex gave her a Panic Switch ring to help her out possibly because he is her brother.
18. Neverseen; Dex is trying to look out for her the whole book like a brother would and ends his prejudice of Fitz for her. Sophie even feels at home and comfortable around him possibly because they are related. He says he will always be there for her.
19. Lodestar; Dex let's Sophie have a sleepover at his house with the others possibly because he wants to spend sibling time with her not just work the whole time.
20. Nightfall; Sophie thought Dex looked "adorably excited" when she was about to Enhance him possibly showing that he is happy that she got a new ability to help them.
21. Nightfall; Dex brought her crush cuffs that Sophie realized he showed that he wanted them to be a thing even though he said the exact opposite possibly showing that he is her brother again. I don't think this one really counts but anyways.
22. Nightfall; They (Sophie and Dex) kiss awkwardly realizing that they shouldn't be a thing and work better as best friends or possible siblings.
23. Flashback; He states that Sophie doesn't know what cute is pointing to himself possibly as a joke because they didn't work out or because they are siblings and he is trying to compare the two of them.
24. Legacy; He is part of Team Valiant lead by Sophie and is used to her bossing them around. He knows she is unmatchable which he doesn't care about unless they are bio siblings. He goes to the meetings with Sophie and the rest of the team. He is also at the battle near the ending but then gets sedated.
25. Unlocked; Dex helps Keefe try out his new abilities possibly for Sophie because they are possible siblings.
26. Stellarlune; Dex tells Sophie about what happened with Keefe and also goes the first time to Elysian with one of his gadgets that Sophie is using on the cover. This could all be foreshadowing that they are siblings.
Vackers; Do I need to explain myself they almost always get along except every now and then like most siblings.
Tam and Linh: They get along super well the only problem is she doesn't get along with their parents.
Keefe has way to many romantic scenes to be her brother and the other choices don't even look close to her.
Dex and Sophie Picture:
