Tamaki: King of the Host Club quite likes to sit on the window ledge and just watch rain fall down against the window pane, sometimes when he’s with his s/o, he’ll lie down with them on a couch or a bed and just listen to the rain fall on the ceiling with soft conversations about whatever’s on their mind. Perfect stay-at-home date, if you ask me
Hikaru: Hikaru is the kid who really enjoys having fun in the rain as long as he’s with the right person. His s/o must be someone who’s willing to drop anything to have fun so when it starts to rain, or even pour, he’ll grab their hand and drag them outside and just spin around in the rain. He might even toss them over his shoulder, twirling them around happily. Maybe even a kiss in the rain
Kaoru: Kaoru, although usually seen with his brother, isn’t the same. He would enjoy going out and playing in the rain but he looks forward to the aftermath. He and his s/o would stay inside and fool around, maybe watch some TV together but then afterwards, when the sun came out and a rainbow flashed across the sky, he would drag his s/o to go see the pretty colours flash in the sky and splash in the puddles with him
Honey: Honey’s still under the impression that rainy days can mostly mean sadness so sometimes he’s in a bad mood when it’s raining. But if he’s with his s/o, it’ll be a fun night. They’ll distract themselves inside with some sort of activity, maybe baking cookies or playing some games. But then he’ll be incredibly amazed by the site of the rainbow afterwords so he’ll want to go out and see it while skipping around on the sidewalk.
Mori: Mori likes rainy days because they’re calming to him. The sound of rain makes him relax and just think through everything that’s happened recently. With his s/o, this is perfect cuddling weather and a great time to spend some quality alone time together. He might not go out of his way to get wet under the rain but he wouldn’t mind it too much.
Kyoya: Kyoya’s s/o would have to drag him away from his work to show him the beauty of rainy days because to him, they’re just a hassle. He would rather stay dry and continue his work but if the rain is really in his way, he would try to continue his day normally, without getting soaked. But if his s/o would like to go dancing in the rain, well he’s not going to let them get pneumonia without him.
Haruhi: Haruhi hates thunderstorms, everyone knows that. But if it’s just a light drizzle or maybe just pouring rain with no chance of thunder and lightning, she’s alright. This is, however, the time when she would like to snuggle under a blanket and would need a bit of reassuring that her s/o wouldn’t leave her alone, just in case it does turn into a thunder storm.