A Pikmin 2 2, in essence.

Hmm, well Breath of the Wild looks to be what I have dreamed of for a long time. Zelda is my favorite series and this is looking to be a huge open world, lots to do, inventory and upgrades, ect.

Witcher 3 is my favorite game of all time right now, so any game that manages to be similar to that is a dream.

Skyrim with a more colourful landscape and reality physics, with some mechanics from Zelda... OH WAIT BREATH OF THE WILD

Pretty much came here to say this. Or StarTropics 3. It would really be a dream come true. Any really good horror game ends up being a dream come true also. 

I would really love to see some more games that touch on different realms (space, ocean, alternate dimensions, etc.). I always thought it would be kind of cool to do an Uncharted-style game under the sea. Maybe you could play as a deep-sea diver that collects underwater treasure and explores different underwater kingdoms and haunted ships and stuff. I feel like they don't do many "deep-sea" games and it has some potential for cool atmosphere. 

But then, I just read it out loud to myself and it actually sounds kind of stupid. Eh, just give me Metroid 5. 

Really, I'd just want to make a SNES style RPG, like Final Fantasy in particular. Those kinds of game I find really enjoyable

Since a lot of people are suggesting sequels and existing games, characters, etc. instead of original ideas, I will suggest one of my own.

I'd like to see an open world game set in the Harry Potter universe (or something very similar), and the game would mechanically be similar to Rockstar's Bully, where you have the University (Hogwarts or something similar), the campus, and then the areas around, like a near town, the forbidden forrest, some other cool areas. Would have some RPG elements where you can specialize in different kinds of magic, and of course you could choose to be good, evil or anything inbetween. Would have the different houses, like Griffindor, Slytherin, etc. that you could be sorted into or could choose, and you'd be able to compete with them, in different activities. With some kind of influence meter for your school's house, so creating a sort of turf war between the houses, trying to sabotage them etc.

Any Kpop fans here? Because I would love to have a Kpop Just Dance game. It might be impossible because the different choreographers.

Don't they have like insane amounts of DLC songs for those games? You'd think they would have quite a few songs from every genre, including K-Pop.

2 ideas, both are doable I think

1. Lord of the Rings game. All films. Kinda similar fighting style to the ones on PS2. LOADS of freedom though. I wanna have a super long Helm's deep level where the whole fight is available. I take control of a soldier or hero and can choose to run up to the wall, stuff the gate, counter-attack at the hole in the wall, anything! I want epic battles that swing back and forth. I wanna have massive battlefields, but none of that conquest crap. Really player choice driven real time battles and be able to trek across all of middle earth. Never got that all encompassing game other than LEGO which isn't the same as what I'm proposing.

2. The ultimate WW2 game. No one would have the balls to do this because I want to play as Nazis and Japanese soldiers. Not because I sympathize with them, but because I want to cover the whole war. We always take over when the Germs and Japs are losing. I want to play as EVERY side in one game though. So we see all the atrocities of those 2 factions as they treat PoWs and citizens awfully, and we see them conquer. We are put in those soldiers' shoes. Then we get to fight them back now that we truly hate them from BEING them in the first part of the game. Maybe even have similar battles like control the Japs in Midway then have the US beat them back. I wanna play as Germany, Japan, Russia, UK, and US all in one game! Maybe even play as a frog and have to run away the whole time! Maybe even play as an African and wonder what the hell is going on! An all encompassing WW2 game has not been done but an FPS where we play the greatest conflict in human history and ALL of the famous battles would be quite the campaign.

Oh also a Naruto MMO. Each city has the different clans that can specialize in different things. Make it fairly streamlined but have vast amounts of classes and types. I could be a bug guy, an Uchiha (if I wanna be a dick), a fat guy, the veiny eyed guys, ANYTHING! I mean honestly this makes itself. Massive world where you unlock the mounts, aka summons, to get around to the major ninja cities.