Downpour Information Post:
There isn't MUCH to learn about Downpour other than that it's rainy all the time. But lemme go into detail.
The Rain:
The rain actually works different in each place. In the ruins, it's naught much but a small drizzle, much like a water sprinkler. Toriel doesn't need an Umbrella in the ruins so she has a hat because...Fashion. In Snowdin, it's your average rain. It pours and pours and that's just how life is.
The people in Snowdin will need an umbrella...But at the same time, that's only if they choose to. Sans usually has a poncho on whenever he's outside, he doesn't want his clothes getting wet. Same with Papyrus.
In Waterfall, it's practically a waterfall, as it is in the name. It's also sometimes storming there....Well, a lot of the time. It's hard to find some place that isn't practically a swimming pool. Undyne lives above her house because...Well, it's flooded and all the stuff she has is just...Poof.
In Hotland, it's practically dry. The water evaporates. The people in Hotland have no clue about the rain. Except for Alphys, of course. They're still trying to figure out how and why it rains in the underground.
For the place Asgore lives in. It's again, only a small drizzle. He likes the drizzle, cause it waters his flowers. He tends to stay in the throne room to water the water peacefully hit the petals of the flowers.
The Characters, Personalities, and Story:
Now, again, not much has changed in these three core parts of the entire lore. But for those that did change, I will explaining briefly.
Frisk:
Frisk doesn't look like your usual Frisk. No double striped shirt that's blue and purple and no closed or squinting eyes. This Frisk is different. For starters, I can't exactly explain what their eyes have going on.
But, you know, I'll think of an explaination sometime soon.
Frisk always carries an umbrella with them. It's helped them do a lot, despite being a mere umbrella. It's their weapon, transportation, and shield. They never leave this umbrella behind.
Their personality is quite understandablely, none. Their personalities all determines which route/timeline they're in.
Genocide: Blunt, rude, hostile, apathetic.
Neutral: --All depends on the amount they spared or the amount they killed--
Pacifist: Stubborn, Generous, Helpful.
The two main things that hasn't changed is the fact they continously have a straight face/poker face on and that they don't talk. People still find Frisk unsettling in the pacifist timeline.
Sans and Papyrus's relationship:
Now, I wouldn't say their relationship is the best but it also isn't the worse. Sans still makes dumb puns (Rain Edition) and Papyrus still wants to capture the human. Both have completely seperate goals, so they tend to bicker a lot. Sans tries to convince him to not capture the human, Papyrus's determination overshadows his thoughts, someone says something they don't mean, bickering ensues. They're still brothers overall and would do anything for each other.
....
Kinda.
Chara:
Now, Chara is a topic all on their own. They're story hasn't changed but the personality has along with appearence, kind of.
Chara is your helpful ghost friend...With their own intentions, of course. Frisk and Chara are actually siblings, with Chara being older. Chara didn't like how they have been treated, so they just left. Ended up falling into the Underground, and soon after perishing due to an illness. Chara is like a guide for Frisk, appearing only to instruct them on what to do, and of course, using them to test things they weren't able to do.
They show up a lot more during the genocide route, only to reflect on Frisk's actions, acting as their own actions. They mean no actual harm, they're just very curious and like testing things out a lot. Ever since they found out about Frisk's power, that's when the true curiousity kicked in. They'd like to not only test the limits, but as well as the power.
Flowey:
OKAY SO THAT WAS REALLY IT OF THE POST BUT WHAT IF FLOWEY WAS AN ECHO FLOWER?! WOULDN'T THAT BE SICK!?!? IDK