Rows 1042-1061 of the attached spreadsheet has been updated with the requested information. Following are the bands and their respective leaders:
1. The Rhyolite Sound-Larry Reha
2. The Sadies-Led by brothers Dallas and Travis Good
3. The Shadowboxers-Adam Hoffman
4. The She's-Hannah Valente
5. The Shelters-Josh Love
6. The Shins-James Mercer
7. The Spencer Lee Band-Spencer Lee
8. The Strokes-Julian Casablancas
9. The Strumbellas-Simon Ward
10. The Temper Trap-Dougy Mandagi
11. The Gentlemen-Beau Patrick Bedford
12. The Turnpike Troubadours-Evan Felker
13. The Vandals-Dave Quackenbush
14. The Walcotts-Tom Cusimano
15. The War & Treaty-Michael Trotter Jr.
16. The War on Drugs-Adam Granduciel
17. The Weeknd-Abel Makkonen Tesfaye
18. The Who-Roger Daltrey
19. The Wild Feathers-Taylor Burns, Ricky Young, Joel King
Since bands rarely specify or label who the leader is, the lead vocalist is usually identified as the leader for the purpose of this research. Apart from Hannah Valente of The She's, all the identified leaders above are cisgender males. Most of them are Caucasians excluding Dougy Mandagi, Michael Trotter Jr. and Abel Tesfaye who are of Indonesian, African-American and Ethiopian descent, respectively.
As for LGBTQ activism, the identified band leader's social media accounts such as Instagram, Twitter and Facebook were checked for any signs of advocacies. We also looked into events, communities and groups they joined. We searched for LGBTQ-related articles that may mention their names and their opinions on LGBTQ rights. After doing an exhaustive research, we were able to determine that the band leaders above are not activists for LGBTQ rights, nor have they expressed strong opinions against the matter.
All details are available within the attached spreadsheet.