Disney should officially make Elsa part of the LGBTQ community in Frozen 3, but not by giving her a romantic partner. Elsa has no romantic interests in both Frozen and Frozen 2, and this isn't necessarily a bad thing. It might simply mean that she is asexual and aromantic. To be asexual (ace) is to feel no sexual attraction, and to be aromantic (aro) is to feel no romantic attraction. Elsa (Idina Menzel) could serve as the perfect ace/aro character to represent this part of the LGBTQ community, and if Disney confirms there will be a Frozen 3, they should make this canon.
Despite having strong platonic and familial relationships, Elsa isn't shown to have any romantic relationships throughout the Frozen franchise. Some fan theories suggest this is because she's gay. The thinking here being that since we don't see any men in her life, perhaps she's attracted to women. Certainly, when she became friends with Honeymaren in the second film, the LGBTQ community was hopeful they might get together. However, by the end of Frozen 2, Elsa and Honeymaren remain as friends, suggesting of the possibility that Elsa doesn't feel any attraction and could be aro/ace. Frozen 3 would be the perfect opportunity to address this.
When Elsa discovers she is the Fifth Spirit in Frozen 2, the words "You are the one you've been waiting for, all of your life," are sung from Iduna to Elsa, hinting that Elsa could be aro/ace. It's clear Elsa does feel other forms of love, as her strong relationship with her sister Anna (Kristen Bell) is a prominent example of this. Aside from this, she simply doesn't have any need for a partner nor does she express any attraction to anyone. Disney should make her asexuality canon in Frozen 3, as she's the perfect character to authentically portray this. Frozen has already portrayed other types of love. Twice now, the franchise has shown acts of true love other than a romantic kiss. Taking one step further in officially announcing Elsa as aro/ace would be the final step, and a huge step forwards for the LGBTQ community.
With approximately 1% of the world's population identifying as asexual - and possibly more as there's still limited data about asexuality - there is a push to get more aro/ace representation out there. As 1% of the human population is an estimated 78 million people, it's not as small a number as it sounds. By the end of Frozen, it's clear Elsa has no interest in romantic relationships, and this is further proven in the opening scene of Frozen 2. While Anna is busy creating romantic fantasies that will save the day in a flashback to their childhood, Elsa's openly repulsed by the whole idea. Years later, both still have the same views towards romance. Anna is happily engaged, whilst Elsa is fulfilled without any romantic interests or notions, accurately representing the asexual and aromantic experience.
It's extremely important to have representation of everyone in the LGBTQ community in media, films, and tv shows. There are many other Disney characters who aren't canonically LGBTQ but are widely accepted by the fanbase, like Mulan, Ursula, and Pleakley - as well as Oaken, who's also from Frozen. LeFou (Josh Gad) from Beauty and the Beast is perhaps the strongest canon LGBTQ character in Disney, with the 2017 remake clearly showing him as gay. This has been confirmed by Director Bill Condon, signifying a shift in Disney's acceptance towards representing the LGBTQ community.
With that in mind, Elsa would make the ideal asexual and aromantic. It's widely accepted by Disney fans, the LGBTQ community, and specifically the aro/ace communities that she's asexual and aromantic, so it should be made canon in Frozen 3. Despite the noticeable steps being made towards representing more asexual and aromantic characters, Frozen 3 having someone as popular as Elsa become part of the LGBTQ canon would be a huge step forwards.