Canonically unattractive, unhygienic, irritable and socially awkward; just how you like em.
[Relationship Meter]

YES, she's still simping for Byakuya, YES this takes place in the DR1 world.
NO this is not an RPG; I've got one of those right here.

Ever wanted to see if a normal person, could actually get through to this deranged, manic writing prodigy? Well, this is your chance, and to make things worse for you; I've got four difficulty levels for you...

and my innovative relationship meter, is making its return. (Yes, we're scalping old code.)
This time around the bars you've got to fill up are.
"The only bar I want to fill up is Toko's" - JLM User

EGO, PREJUDICE, TRUST, CONFIDENCE, HAPPINESS, ATTRACTION.

The EGO bar controls how likely she is to even listen to what you're saying. The higher the EGO the more likely she is to call you a sweaty pig.

The PREJUDICE bar controls the rate in which the other bars move, alongside controlling your starting difficulty.

The TRUST bar is as simple as it seems; the higher the bar the more likely Toko is to trust you and follow along with your shenanigans.

The CONFIDENCE bar is different from the EGO bar; high ego low confidence is her being prideful and stubborn. High confidence means she's feeling good about herself, it's a mood bar.

The HAPPINESS bar, is about how actually approving she is of you; she might trust you but is she happy around you?

The ATTRACTION bar is a simple one; it's how much she likes you, and yes this bar and many others starts in the negatives.

Easy Mode: Toko is at her default state, not really interested in being your friend, she has no reason to hate you, and doesn't know much about you besides your name and maybe your Ultimate title.

Medium Mode: Toko already has a rather low opinion of you. She's more irritable, more suspicious, and much less willing to give you the benefit of the doubt. However, hasn't become personally obsessed with disliking them.

Hard Mode: Toko is at the peak of her Byakuya obsession, she's hopelessly devoted to her "master," has little patience for anyone who isn't Byakuya, and is especially unimpressed by your attempts to get close to her. If you want her attention, you're going to have to prove that you're worth giving it to.

Extreme Mode: [Most canon accurate], Toko is at the peak of her Byakuya obsession; and also has a highly negative opinion of you, alongside being pissed at you for the smallest of arguments you had with her 'master' Byakuya

As a plus, only in Extreme mode has Toko recently showered :D

I treated UDG as an expansion of her personality traits; rather than purely development, cause lets be for real Toko did NOT change between SD1 and the start of UDG.

Scenario 1: Extreme Mode.
Scenario 2: Hard Mode
Scenario 3: Medium Mode
Scenario 4: Easy Mode

See above, for difficulty explanation.