Uzi's reactions to holding her baby siblings for the first time (plus extra bits :3)
With Tomahawk, she's terrified. Of messing up, of her parents messing up, of her parents replacing her with him, of needing to be the one to step up and raise him, of the possibility history will repeat itself, that she'll be the one who needs kicked out of their lives, that she'll hurt him, that something will go so wrong that the family she finally got back won't survive. She has a few panic attacks she's not proud of about it. But the second she's actually holding her baby brother, she's just happy. She can't imagine a world where she lets anyone or anything hurt him. Actually almost to her detriment, as she's terrified that by just holding him she'll ruin him, destroy his life before it's even begun. She's an emotional wreck, but so happy. She cries freely in front of everyone when she holds him.
She ends up reading a LOT of parenting books, and tries to look up everything she can on being a sibling. She doesn't want to ask N about his experience in being a big brother, because of how Cyn ended up, but he's remorsefully happy to explain some of the things they used to do together before.... before.
With Scope, she's ALSO a nervous wreck. Scope's diet issue not being resolved until she's in an upgraded body leaves her pretty fragile even for a pillbaby, and it's even more terrifying to Uzi. When she held Scope during that very brief period in time, she was so fiercely protective and gentle it messed with her head a bit. She didn't quite understand what was happening to herself and was terrified she'd hurt Scope somehow like that, and the fact Scope was at risk of "starving" constantly meant that she was only getting weaker by the day. She mostly hung out with Tomahawk, made sure he was okay during that time because she was so worried that something horrible would happen to Scope. She tried to not get attached, trying so hard to spare herself the pain of losing her little sister, but it failed so badly she ended up needing to be limited on how often she could watch over her.
The day Nori ends up finding out what the issue was, and giving her a full oil diet, Uzi's so elated she can't stop herself from staying nearby both of her siblings, hugging them, holding them both, and just hovering nearby. She needs a bit before she can stomach leaving their side, but it's with the giddiest feeling in the world that everything will be okay.
With Tracer, she's wary, but not nearly as bad as before. They know pretty much right away what to expect, and Uzi's among the first to hold [him]. She's ecstatic, happy as can be. 8 years may have passed, but she still cries holding [him] the first time.
Tracer also figures out very early on he's trans, even before going to school for the first time. And it's Uzi he comes to about it first. To which she's very supportive, reassuring him she's not going to abandon her baby brother, and that nobody else would mind either. She also helps him learn what transgender is, because Tracer wouldn't know the term itself yet. And she's there when he comes out to everyone else :)