Blu's Links
Blu cares a lot about her younger sister, and they enjoy playing with each other. Because Dria is younger than her, she always makes sure that her younger sister is OK. Blu, being the Water Type, is glad that Dria is her sister, mainly because of how rare the Dragon Type is.
Dria is a good younger sister for Blu, and she does like being with her older sister. She always follows rules, and she always cares about how others feel, so she'd never try to ruin anyone's life. She isn't really sure about why being Dragon Type is so special, but she's happy about it if others are happy about it.
Blu feels like Pinky is an older sister to her and, with both being part of the Main Trio, she enjoys being with Pinky as well. Blu looks up to Pinky greatly, and does want to be like her someday, especially since both have missing tails (though Blu has a little bob tail as a result of this). Blu also hopes she could use a Fairy Type move someday.
Pinky tends to treat Blu like she is one of her younger sisters, and she's also quite protective of her, though that could also be because they're both part of the Main Trio. Pinky doesn't know that she's one of Blu's role models, though. Because she was originally Fire Type (and still can use Flamethrower), Pinky does think that Blu could learn a move of a different type one day, but it might be an Ice Type move instead.
Blu finds Jewel funny sometimes, especially when she tries to act posh like her sister is. They're both part of the Main Trio, though Blu doesn't look up to Jewel as much as she looks up to Pinky. She sometimes wishes Jewel wasn't that nervous around her, but understands that it's because Jewel is Electric Type and she is Water Type.
Jewel likes to joke around with Blu, and she also likes to pretend to act like her sister as well. Being part of the Main Trio with Blu, Jewel likes to think Blu looks up to her, though she knows that Blu looks up to Pinky more. She always acts (and attacks) carefully when around her (Blu) because she's scared of water, and doesn't want to hurt the young Water Type.