You know there's a reason why I ship certain characters in series... One is development, and two is there has to be that specific moment that really hints at them becoming canon for you to go like it's gonna go that way.
In Naruto:
There were two moments:
That was my big jump start, and then there was this:
That made me realize this was going to be canon above all us.. Like I was already shipper for these two especially after The Tenchi Bridge scene, but this scene and ofcourse this sold me:
Want more examples from other series well then lets look at Bleach:
IchiRuki
You know which moment started my road to shipping them:
This right here was my jump start in shipping these two, and what convinced they were gonna end up together:
Even though I feel the series should've ended here cause it felt so powerful, Kubo has always supported Ichigo and Rukia throughout color pages, the series itself (excluding the last 20 chapters of the final arc though I'd argue otherwise cause there was a little interaction in the final chapter too), and poems too.
Oh and this too:
Them feels. ah it takes me back... moving along lol
Yes i know Ichiheme happened, and why was I okay with that? cause at least it felt somewhat natural even though I felt there should've been more. Sure was it one-side yes. The one thing Ichihime and RenRuki have over NH and SS are moments. It's there, and they kinda make sense. It just needed to be more convincing that's all.
Next we have Raku x Chitoge:
This was the moment that both jump started, and mainly convinced me that they were gonna be a couple.
Unlike the last two this one actually did happen and it was beautiful though I will argue that at somepoint the story was trying to beat around the bush cough cough year two lol Funny enough I was actually a Raku x Onodera shipper at the start of the series mainly due to the fact Raku x Onodera actually did like each other a lot. The issue was them becoming canon would always be interruppted by something. Sure there were small moments here and there were it kinda worked, but ultimately I knew it was gonna be Raku x Chitoge. Why was I okay with this even though I started off as a Raku x Onodera shipper because there relationship as friends I'd argue best friends are great, and by the end of the manga they still talk with one another just like with Ichigo and Rukia. it's not like they are completely ignoring one another like another series that we all know of.
Then you have Yuuji x Haruka from Sukedachi 9:
I've mentioned it before, but this is the series that was written by Kishi's younger brother Seishi, and he was pushing these two just like Masashi did with NS throughout Naruto, and this moment did tell me they were gonna be canon, and you wanna know what happened with Haruka that never happened with Sakura. Realization! how?
The pairing itself is kinda left to your interpretation on if they got together or not, but i believe that they did. It's just a little sad that Seishi wasn't able to do it cause he kinda rushed the ending but still fitting in it's own way. Also no third wheel, no side pairings whatsoever so I commend him for that.
Basically the point I'm trying to get at here with the series I mentioned and their pairings aside from Sukedachi 9 which only had one main pairing, yes other pairings happened but they had support that made sense. NH and SS don't have that at all that's why it lacks in the overall sense of the narrative. Look I get it this is a shounen series, but if you're going to do romance then atleast have it make sense and be believable.