Tbh, the only characters I could see with a solo game are: Sora, Riku, Roxas, Aqua. Maybe Lea? I don't think Kairi would be a good lead, and yet I can imagine a possibility of her getting a solo game anyway because the fanbase is always saying they want her to get more spotlight. They assume more spotlight would make her a better character, but the problem is the writing, and that would still be a problem even if the character had more screentime.
If that’s your opinion then sure can’t argue with with other people opinions (since I too have opinions of my own) but if you think it’s a fact then I disagree, about Axel i somewhat agree but for me Aqua (to me) is pretty much just an adult kh2 kairi, and kh2 kairi doesn’t have enough character to be a sole main protagonist of her own game, also I remember Nomura said he was struggling on what to make aqua say in 0.2, don’t remember when was that interview tbh but that just shows that Aqua can’t be a protagonist of a sole full game for her character just not that easy to come up with a dialogue or story that revolves around her other then wanting to be with Terra and ven, 0.2 was her game yes But still I can’t see her get a real “full game” like Roxas kh358/2days, her limit is just a kh3 demo or better say epilogue which is 0.2, Aqua’s character is strong and fit to play a hero, but compare to other main protagonists in other franchises? Aqua feels weak in that comparison she doesn’t strike me as a main protagonist of a sole Game, when I compare her to other main protagonist, she is fit to be a main character in a shared game like Nier Automata or final fantasy 6 but not the sole main character, she just doesn’t have the the aura of a main protagonist that I usually see, her character I usually see among side main characters in final fantasy games or other franchises, but I never saw her type of a character as the true main protagonist,
for example like Y’shtola in ffxiv, she is soo popular in Japan cause she is a cute cat girl (altho I like her and soo many westerns do) but that’s the problem... just because she is a cute cat girl...she now represents ffxiv in Dissdia Nt, when in fact she doesn’t represent ffxiv she is not the face of the game as many fans claim, among the scions minfilia Alphinaud and Lyse played bigger roles in ffxiv, one of them should represent ffxiv not y’shtola,
Aqua has similarities to Y’shtola
1. Wise
2. Smart
3. Quite not talkative type
4. she’s a mage
5. Y’shtola is seen as best girl when the story is barely about her or barely involve her in the main plot (ironically like aqua in the first birth by sleep)
even tho I love Y’shtola soo much and want her in my party 24/7 she is still not fit to be a main protagonist of a sole game, I would honestly get tired, bored and sleepy if she got her own game.
that’s all my opinion ofc not fact we all have different views so not expecting you to agree with it.