If FED noodle twins get lil siblings, would pj bully nightmare into playing with him. Nightmare screeching for dad to save him from the sharp baby teeth. Or dream trying to reach into the hidey hole gradient has set up shop in. Gradient is Not a brave baby boy.
PJ is a little gremlin, no matter the age, but especially as a baby/toddler. For some reason, he had (and still will have) a huge attachment to Nightmare. Whether that was cuz he looked up to him, or just really likes annoying him, who knows.
Gradient is far more shy, and is more likely to be reading with Nightmare than playing with the others. However, his admiration is mainly towards Dream, who likely won him over via cuddling and stuffed animals. He's willing to try smaller activities as long as Dream walks him through them, and the Guardian is all too willing to help Gradient come out of his shell when he wants to!