Evidence from SE that Cloud had a romantic bond with Aerith:
1.
“After solving the puzzle about Cait Sith’s replaceable body, he tells one last fortune of Cloud and Aerith’s affinity. Cait Sith’s lines, which seem to expect Cloud and Aerith’s wedding, now makes it more painful.” ~Final Fantasy VII Dismantled, Square Enix
If Cloud Strife did not love Aerith, how could a wedding prediction become "more painful" after her death? The only way a wedding prediction would become "more painful" is if there was a basis for which a wedding could happen (ie:
mutual romance).
2.
"And having two heroines, Aerith and Tifa, and having the hero waver between them, at the time that was something new.” ~Interview with the creators, pg. 8-13, 10th Anniversary Ultimania
This quote tells us that Cloud wavered between Aerith and Tifa -- which means that his relationship with both women was more than a friendship. The only way Cloud could
"waver" to Aerith is if he was romantically interested in her.
3.
"The thing which she is unable to hide in her irritation towards Cloud is the fact that he isn’t merely dragging the past around, but because that reason might perhaps be related to Aerith.
FFVII: Seeing Cloud and Aerith developing their world together before her eyes, she inadvertently lets slip her peevish feelings.
AC: Upon knowing that Cloud had been residing in Aerith’s church after leaving the place they had been living in together, her expression becomes complex.” ~Tifa’s character profile, 10th Anniversary Ultimania
SE tells us that Tifa is jealous of Cloud's relationship with Aerith in both Final Fantasy VII and Advent Children. Given the context with which this information is presented, Tifa's jealously stems from the fact that her and Cloud's romantic bond is threatened by Cloud's romantic bond with Aerith.
4.
"Both of them share feelings for Cloud — Tifa was close to Aerith, who can also be called a love rival. With that point in mind, they were also good friends. Nevertheless, it is not hard to imagine that she carries complex feelings as a woman toward Aerith, who had built up a special bond with Cloud that was different from Tifa's. Tifa's complicated feelings continue even in AC, two years after Aerith had departed the world." ~Final Fantasy 10th Anniversary Ultimania
SE provides us the context for which the information is to be viewed: Aerith and Tifa are
"love rivals". When SE says that Aerith had,
"built up a special bond with Cloud that was different from Tifa's," it's not saying that one relationship is romantic and the other isn't. It's saying that although both relationships are romantic, Tifa wishes she had a romantic bond with Cloud that was similar to his romantic bond with Aerith. I'd imagine this means Tifa wishes her romantic relationship with Cloud was more flirtatious, open, and forward.
5.
"#111: The Planet’s largest amusement park is run by Dio. Cloud and company visit this place many times in their battle. They meet Cait Sith here. A promised date that ends in a magical night. In the city of desire that floats above the sands, the light memory of the two people is asleep even now…Aerith: “I think I must have seen him again, in you… But you’re different. Things are different… No, Cloud… I’m searching for you…” ~Final Fantasy Art Collection
“In Aerith’s case, if you play the game normally,the partner that generally comes will be Aerith.” ~Final Fantasy VII Dismantled
“Oh, Cloud…I enjoyed our date at the Gold Saucer. The view from the gondola that night was really beautiful. I’ll never forget it. I’ll never forget you, Cloud…” ~Aerith, Final Fantasy VII Dismantled, Square Enix
Dates are inherently romantic. Cloud agrees to go on a date with Aerith.
6.
“Marlene is a sharp girl - Even though she’s only 4 years old, Marlene is perceptive and well attuned to the woman mind. The scene where she ascertains that Aerith has favor for Cloud and tells him so, then says “I won’t tell Tifa!” demonstrates this grownup behavior.” ~Final Fantasy VII, 25th Anniversary Ultimania
Therefore, this is the canon version of this scene:
Marlene: "Guess what? Guess what? Aeris was asking me lots of questions. Like what kind of person Cloud is. I bet she likes you, Cloud!"
Cloud: "Let’s hope so."
Marlene: "I won’t tell Tifa."
Cloud saying,
"Let's hope so" tells us that Cloud would like for there to be a mutual romantic relationship between him and Aerith.
7.
"She's a girl with impressive eyes. She's around my age, or elder by one or two years. But the innocent radiance in her eyes simply makes her suddenly look younger.
Aerith: "Excuse me, what happened?"
She asked me the question, and then I bought a flower from her, which is rare in Midgar.
Maybe she's pleased that the flower was sold, because the worried look on her face had vanished. If this smile costs only one gil, it is a good purchase." ~Final Fantasy Dismantled
"After the explosion of First Reactor, Cloud met Aerith while running away alone. Cloud left the place, remembering the mysterious feeling he had for Aerith from the small conversation. He then reunited with AVALANCHE safely, and left for their base…" ~Final Fantasy VII, Story Playback, Page 111
Cloud's initial encounter with Aerith tells us that he is attracted to her physical appearance. This begins what is sure to follow -- Cloud's romantic feelings for Aerith.
Honorable mentions that highlight Cloud and Aerith's "special bond," but do not necessarily prove Cloud had romantic feelings for Aerith:
1. Cloud to Aerith in Cosmo Canyon:
“But I’m......we’re here for you, right?”
2. Cloud and Aerith share their first of two dates at Green Park in the Sector 6 Slum:
“Date in the Park: In Scene 04-10, Zack and Aerith have a date in Green Park in the sector 6 slum. An identical situation is seen in “FFVII” as well, which features a scene of Cloud and Aerith on a date in the same park.” ~CC Ultimania, Square Enix
3. Cloud laughs for only Aerith in Final Fantasy VII.
4. Barret observes that Aerith is the first person Cloud is willing to fight for besides himself.
Debatable points:
1. Cloud was triggered into a romantic flashback in Aerith's house after meeting her. Was this a clue from SE that with the introduction of Aerith, Cloud could be changing his mind about the idea of having an older girlfriend? What else could have triggered Cloud into this flashback aside from Cloud's romantic infatuation with Aerith?
2. "Each carries their own feelings and love for Aerith. In this story, Cloud also carries his undying feeling for Aerith even to this very day…” ~Nomura, Square Enix
When *undying* is applied to a feeling or emotion that someone has, it is eternal and forever. So although you can make the argument that *undying* when applied to a fictional creature doesn’t mean eternal and forever, when the word “undying” is applied to a human emotion or feeling, it *IS* eternal and forever. Therefore, it does not make sense that Nomura would be referring to Cloud’s guilt as *undying* when the entire point of Advent Children is to rid Cloud of his guilt.
3. "There’s no relationship from FFVII to the Kingdom Hearts stories. I consider them separate stories. But if you play Kingdom Hearts, toward the end, some of the questions about the relationship between Cloud and Aeris in Final Fantasy VII might be answered.” ~Nomura, Square Enix
Nomura specifically says that although the two universes of Kingdom Hearts and FFVII are separate, the Kingdom Hearts universe might help answer questions about the relationship between Cloud and Aerith as it pertains to Final Fantasy VII’s universe.
So what does this ending tell us about Cloud and Aerith's relationship?
4. SE views Cloud and Aerith as a romantic couple in Final Fantasy VII because they give them romantic cameos in Final Fantasy IX and Final Fantasy Airborne Brigade.
5. Final Fantasy Dissidia: At the end of Dissidia, Cloud is seen entering a flower field. This flower field is eerily similar to the flower fields Aerith has appeared in, and the flower field shown during the ending credits of Advent Children. Cloud is also holding Aerith’s Holy materia. Before this takes place, it is stated by Zidane that each character is, “…returning to where we’re supposed to be.” Cloud is supposed to be with Aerith, which is why he returns to a flower field. Interestingly, Squall of Final Fantasy VIII is seen leaving when a white feather falls from the sky. This feather represents Rinoa. The parallels between Cloud x Aerith and Squall x Rinoa are obvious. During the game Cloud also says, “The one I really want to meet is…” And although he doesn’t finish his sentence, given the ending scene of Dissidia and the ending of Final Fantasy VII, it is clear who Cloud has a desire to meet in the
6. "It was the sound of Cloud’s heart cracking. It was the cry of his heart that could never be healed of the grief he had towards Aerith’s death, the blame towards himself and the hatred he had for Sephiroth…There was nothing she could do about Cloud’s suffering and the pain ached in her heart.” ~Maiden of the Planet, Square Enix
Cloud’s heart cracked when Aerith died.
7. “Cloud was her friend, her *koibito* (lover in Japanese) - a symbol of what was important to her, and someone to be protected.” ~Case of Lifestream: White, Square Enix
8. SE pays homage to the hand reach scene in Advent Children, a scene where Cloud expresses a desire to meet Aerith in the Promised Land (ie: his place of supreme happiness). Cloud is also shown riding around flower fields at the end of AC/C -- flower fields that are expliclity stated to represent Aerith. Is Cloud continuing his search to be with Aerith in the Promised Land?