So sorry it's taken me so long to answer this 😭😭 anyway, of course!

Both of them are hopeless romantics, but in opposite ways. Roy is self-sacrificial and all "I'd rather love you from afar than not at all" total cheese-fest, while Wally is action driven. While I don't think he'd be the first to "confess" (internalized homophobia), he would definitely be the one going out of his way to show his love. He's setting up the dates, even if he shows up later than planned. He's taking Roy wherever he wants to go. Once he's comfortable saying it, "i love you" becomes the end of every conversation they have. He is not gonna love someone and not doing anything about it. Roy says it's overbearing, but he appreciates it deep down.

2. They have very conflicting opinions on marriage, Wally being super pro-marriage and all about that sort of American Dream, settling down, having kids and such, while Roy believes marriage is completely unnecessary and moreso even discriminatory, as he's gone over in the comics (in either Titans or Outsiders, I can't remember). They would have disagreements about it often and Wally would probably end up very butthurt over it. They eventually would settle on a small courthouse elopement, if anything.

3. They're both extremely dramatic and hotheaded, so as teenagers they were comically bad at having a relationship, bickering and breaking up over everything. After any particularly distressing argument, they'd both go into their rooms in Titan's Tower and blast Paramore or Avril Lavigne. Absolutely dramatic teenagers. The Titan's would split up into teams to comfort them, and in no time they'd be back together like nothing happened.

4. I've seen this mentioned before on here, but Roy is a troublemaker who would take every chance he could to get Wally to do something reckless with him. And Wally would, either because he's head-over-heels or just afraid of being a stick in the mud.

5. They get the "siblings or dating" question so much that they've both considered dyeing their hair to avoid it, but unfortunately, they both love the ginger look. It's also kind of their own faults though, because they share a lot of their clothes on top of already looking similar physically.

6. Wally was lowk a right-leaning centrist (so basically a right-winger) as a teenager and Roy, like his dad, was an intense leftist and dedicated a good amount of effort to keep Wally from straying too far into that line of thinking. Then, Barry died and wtv, Wally learned to be a better person, etc etc, and now they're decently similar in their politics, Wally is just a little less radical than Roy. (in my mind Roy being a fed only exists within the context that makes the best angst.)

7. Disgusting amounts of pda. Not exactly making out or scandalous touching, but just, their hands are always on each other somewhere. Or they're just close enough that their shoulders touch. They take up entire couches and it's just because they're sitting on opposite ends and don't want to move but still need to feel each other. Constantly.

8. As adults they have very different music tastes. Wally likes Johnny Cash and 70s rock while Roy is 90s everything. But, as teenagers, they would share headphones and cds (like Paramore, and Avril Lavigne.)