For example, all things I’ve done:

• If I’m playing a bard, I might compose a song about their character
• If I’m playing a journalist, I might interview them for an article
• If I’m playing a bartender, I might name a dish or cocktail after them
• If I’m playing a private eye, I might interrogate them about their whereabouts during a recent crime
• If I’m playing an evil scientist, I might contrive a reason for why they’re uniquely important for the purpose of my experiments.

With varying degrees of success, I also try to make people laugh, most often at the expense of my own character’s flaws. I think this also has the double effect of signalling to the other player that I’m aware of these flaws and not gonna take it too seriously OOC if they wanna rib or even just disagree with my character. Which is also a signal I seek out in other preferred scene partners. For example, in a single pose my character might brag about how they can totally clear a hurdle, fail spectacularly, and then get embarrassed. And that way, hopefully you the player know that I’m not expecting you to glaze how cool and perfect my character is, which I think nobody really enjoys doing.

1. Try to think about what other PCs in the scene are into, based on their character pages/previous conversations. Try to engage at least one of those areas where possible, in the set, conversation, or whatever.

2. Read the other PCs’ poses. Try to make sure I am reacting to what they give me. In larger scenes, I’ll usually pick one person to primarily react to, because otherwise the poses get real long and real busy. But always try to react to something.

3. Leave something in the pose that takes the scene further and gives other people something to react to. Don’t just answer a question, ask one of your own. Do some action that requires a reaction. (And seriously, in a talk-heavy scene, never just flatly answer someone’s question without lobbing the conversational ball back with some sort of comment or question that can also be responded to. Don’t make someone have to interview you.)

For me to personally be interesting to others (and I’m sure all of this is going to be really obvious but YOU ASKED THE QUESTION OK), I try to:

• Look up the person I’m RPing with’s sheet/hooks/background before we play for the first time so I can try to see their characterization (I don’t read every single background in detail but I do try to have an idea of who this character is, and then think not just about how my guy would react to what they do, but how their guy might react to what I do)
• Think about the ways where my character can be silly/dumb/wrong, then BE WILLING to look silly/dumb/wrong, often purposefully being silly/dumb/wrong bc humor like @sao said
• Use props (I especially like to use kids but also animals are fun, or random NPCs who are there for a purpose that others can react to)
• Think about when to press myself forward and when to pull back to allow someone else’s character to shine, especially if it’s a scene where their character is more suited to whatever’s happening

ANYWAY those are my immediate thoughts!

Be… interesting… this is not helpful to anyone.

It helps if you become bird.