Many users across Discord will without a doubt hate Discord light mode, there is a small number of people however that do have visual impairments that force them to use Discord light mode for medical reasons. There's also the handful that use Discord light mode just because they dislike white on dark text. From what I've seen on the discord, there is a small amount of roles such as Community Advisor and Honorable Gamer. There's also the more widespread roles such as Regulars/Members that cause a lot of strain on the eyes. My suggestion is to tweak them a bit to prevent this.
This link has a lot of resources that give examples and the actual hex codes to change the role colors.
https://research.blaseball-reference.com/Improving_Accessibility__Contrast_in_Discord_Team_Roles_1.2.pdf
Here's also an example that I saw of the roles while using light mode:
P.S. My eyeballs are now empty sockets from testing all this ;-;