fellow tamers
TAKATO MATSUKI/ TAKATO MATSUDA
She's very close to him and there are really good friends. As he said, "You would talk to me when no one else would." She is always cheering him up and helping him out by listening to him. She believes in him, and just likes she's there for him, he is there for her. He seems most affecting by her depression and the death of her partner almost made him insane. I think he would do pretty much anything for her.
RUKI MAKINO/RIKA NONAKA
Ruki is a spitfire-ready-to-fight-"Come and get some" kind of girl. The exact opposite of Juri- so you think they would fight a lot? No! They are like best-friends. She treats Juri like a sister by giving her advice and helping her out. She is the only person she is actually nice to (she's civil to the rest). She even lets her hug her, they are very close. When Ruki came out of the cave in Song of Sakuyomon Juri says, "I thought I might have lost another friend" and Ruki comforted her. I guess I am right when I say they are best-friends forever.
JENRYA LEE/HENRY WONG
Lee and Juri aren't particularly close but they are friends. They both respect each other and I think they both see eye to eye on things. Given time they both could be really good friends but the whole Leomon's death stopped the friendship's growth.
RYO AKIYAMA
Never have they talked to each other. Heck I don't even think they know each other's name. I'm not even sure that Ryo knows that Leomon has died! She also isn't too impressed with Ryo, when he was there and everybody was like "OOH RYO!" she was more like, "Where is Ruki?"
SHIUCHON LEE/SUZY WONG
I think her and Shiuchon would have gotten along great because of their happy personalities but unfortunatly Shiuchon came right around the time Leomon died so they never got time to bond.
HIROKAZU SHIODA/KAZU SHIODA
Hirokazu and Juri, they are not really friends but really close acquaintances. For a while she was part of Hirokazu and Kenta's group as wana-bee tamers. He thinks she is weird and vice versa.
KENTA KITAGAWA
Well there isn't a whole lot of interaction here until J-Reaper took her place and then he sort of comforted her a lot. Other then that- no real interaction.
MAKO (?) and AI
They never met but I have a feeling they will become very close since they are the tamers of Impmon.
Digimon
Leomon: Go to the Leomon section
Guilmon: They get along pretty well. She thinks he is cute- much to the dismay of Takato ("You mean cool, right?") and he seems to play with her.
Renamon: I think Renamon pities her for the death of Leomon. She seems to know her pretty well despite the fact they never really talked.
Terriermon: No interaction whatsoever
Gaurdromon: Same here
MarineAngemon: Awww! It would be cute but no interaction. He came while J-Reaper was in place of Juri.
Calumon: Probably they get along the best (well maybe Ruki and Impmon) out of the Non-Tamers-Partner thing. Calumon loves Juri (not like that) and wishes we would get better. He likes to stay with her and she often gives him her Creampuffs. Later they get super close and they would do pretty much anything together.
Impmon: There is tension there. The whole "You killed my digimon" thing doesn't make them to close. Even so Juri doesn't wish for his destruction. She feels nervous around him, but wouldn't you? Impmon feels in debt to Juri for his crimes and will do anything to save her. Thankfully in the end she forgives him and everything thing is ok between them.
Other friends
I don't really have any info except one of them is named Miki- she hangs around three other girls who appear seldomly- more so now that Juri is a tamer.