About the Yuji/Junpei tragedy, they barely had time together, but Yuji immediately formed an unusually deep emotional connection with Junpei, like how he told Junpei about his grandfather's death and no one else. That's a huge deal. Yuji had only just met him, yet Junpei became someone he could open up to about something that deeply personal.
Yeah, their connection was fast, but it wasn't shallow. Yuji recognized something in Junpei and wanted to be there for him. Yuji never got that future, though--the one where they studied together, fought the villains together, took on the whole world together. He barely got the beginning of a friendship before Junpei was ripped away.
And for Junpei, Yuji would've quickly meant everything. 😭
They met and somehow became one of the most important people in each other's lives almost immediately. They probably wouldn't say it out loud, but they were well on their way to truly loving each other. And that's the biggest tragedy of all. A very real love story was stolen from them and us viewers. Now we'll never know. (But some of us already know.)