Tao's favorite things in life seem to be, in no particular order: family, food, sleep and big breasts. She enjoys fondling and burying her head in Litchi's "airbags," tells Noel she should eat more meat buns to "make her boobies bigger," and spends much of Continuum Shift eating, sleeping and groping every other female character she comes across, even asking Bang if he's visiting Litchi's clinic to fondle her breasts like she is.
Taokaka: "Oh Boobie Ladyyyy, where aaaare yooou? I wanna play with your bouncy boobies!"
Taokaka is obsessed with breasts, particularly Litchi's — or, as she calls her, "Boobie Lady." Litchi, for her part, seems completely oblivious to the possibility that this interest might be anything but completely innocent, even when Taokaka does things like try to "eat" them or makes comments like "You always have nice, comfy airbags."
She's not limited to groping Litchi's breasts, either. In Continuum Shift Tsubaki becomes a victim of Tao's ravenous lust for boobies. Noel would be as well, if she weren't flat-chested, something Taokaka has to make a point of mentioning every time she sees her. To round out this list, Chronophantasma sees Tao looking for "Lacking Lady" on Ragna's behalf only to end up groping Makoto in the latter's Arcade mode.
In a non-canon segment, Litchi was apparently very... "thorough" when examining Noel's "beautiful, lithe" body in a Teach Me, Ms. Litchi: Reloaded segment... and doesn't realize she was being so "thorough" because it was like "a dream come true".
Also, it's hard not to envision Litchi Faye Ling as an ambiguousbisexual given her propensity to dress other girls up in cute outfits and dote over them (Noel in Calamity Trigger, Tsubaki in Continuum Shift). The fact that she is the most common target of Taokaka's breast groping, and seems almost tolerant (albeit embarassed) of it on a few occasions only adds to the speculation.
Noel has become quite a case of Even the Girls Want Her, as Litchi has a fetish for dressing Noel up in cute outfits, and Makoto is extremely protective of her. There's also a lot of Noel X Rachel art, and much of it is official!
Jin is... a leetleobsessed with Ragna. "Ah~! Long time no see...BROTHER!!!~"
The creators aren't even trying to hide it. In Teach Me Ms. Litchi he has hearts over his head and in his eyes every time Ragna speaks.
Jin's obsession is played with a lot in the various gag reel endings in the story modes - even in those for mostly unrelated characters. From Relius Clover's BBCS Extend gag reel, where he mind-swaps several of the other characters, in particular Ragna and Jin: