One,
two,
three. I believe you can download the whole folder there. You can also instal dropbox and ask Xela to add you there. It will download everything by itself, but there is a lot of junk too.
Existing gifts are in game/contant/items/gift.
The idea was to have very different gifts that might or might not work depending on characters traits, and also some general-purpose ones that will work every time but won't be as effective. Gifts have a json with logics, it's game/contanet/db/gifts.json. It's outdated now, since at the beginning of the year we changed traits system a bit, but it might give you the overall picture.
All gifts cannot be used for anything, and simply disappear after you give them, increasing (or decreasing) disposition.
So if you want to do something simple (but still time consuming), you could try to come up with different gifts based on those icons in db and cut those icons like we did for all other items. Maybe write name and a short description in json if you feel like it. Of course you don't have to use only those icons in db, but we have so many that looking for new ones is probably an overkill.
Icons for traits are more complex and creative task. You saw our elemental icons and maybe also race and main personality icons too.
So the idea to to have smaller, less detailed but still understandable icons for all or most of the traits. Our traits are in game/contant/db, in jsons starting with "traits_".
To make an example, try to switch google into searching images mode and enter "boobs icons".
Since you have to search for decent pictures and edit them, it's obviously much more difficult than gifts. That's how I made main personality icons half a year ago.
Even in the case of boobs you will need 4 similar, yet different icons for all 4 traits.
Lines/interactions are based on imagination mostly. Writing skills are good too, but I managed to make them all with zero writing skills
I don't want to force you into writing interactions, but if you want to, you could take a look at game/library/interactions/GM - go out.rpy, starting with label interactions_eattogether string (lines before it are commented out and never used). You cannot see the whole logic from the game, since there are many checks for very different cases.
At this point I would welcomed even concept without coding, I mean stuff like possible checks and events.
You can also come up with ideas and concepts for other types of spending time together options. It's 90% of imagination, 10% of coding. And I have problems with this kind of imagination lately, so...
If anyone is willing to come up with personal quest for Tenten, that would be cool too. I have ideas or ready quests for everyone else from naruto pack, but I stuck with her.
