EDIT: For whatever reason, this no longer works to update the relationship values, not sure why. Can use it to modify body part to your heart's content, though.
The easiest way is to talk to the character you want to bump the stats on - MAKE SURE YOU HIT AT LEAST ONE OPTION TO CHANGE A Friendship/Love/Fear VALUE, otherwise the last step won't work. You can leave the conversation after you do so.
Hit F12, type SugarCube.State.active.variables into the console and hit enter (capitalization is important - and I'm not sure if it's because I've done this in HTML games so many times, bit it should autocomplete when you start typing just to make sure you get the case right)
Click the arrow on the left of the italiziced text that pops up to expand the options
About 2/3 of the way down, there's a line that says indexNPC - the number that's there is the person you need to find in the next step.
Expand the arrow next to the "Characters" line, then expand the subline that your character is in (In my case, she was #2, so I expanded the [0...99] field. Find the number in question, then expand that line (again, in my case, #2)
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Now expand "Relationships" and change the VALUE line in Fear/Friendship/Love to whatever the hell you want - this is the step you needed to talk to them for. If you jump into relationships before a value changes, this section has nothing in it
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NOTE: You're still checking CHARACTERS, even if your target is a resident and not a student, as shown here
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If you want to change body characteristics (give your partner bigger boobs, make your (female PC's) roomate a transgendered woman, that sort of thing) - expand the BODY line for the character in question and go nuts
EDIT: This USED to work - doing further testing to see why the resident's (Savannah Lewis in the example) values aren't updating