I don't know about ranked and space-time teams. I don't really do space-time because I just couldn't be bothered. Ranked battles, with the 3 teams of your ninjas, is kind of a lot to make for someone else. But I can show you a general purpose team that I think will do well for you, and two other ones better suited for timed events like Sage World Battlefields and Training Grounds.

Kind of a stall team. Everyone is there to support Kushina and keep her around as long as possible so she can scale up and do a lot of damage. Minato gives Kushina health regen when she does ninjutsu damage. Also, Minato and Kushina combo off each other's chases so that's nice. On top of that, Sakura will keep everyone healthy with her mystery and her slug summons. She's also hard to kill because she has a dodge and will revive if a slug is around. Fire main buffs Kushina with the Red Lotus passive and helps her reduce her cooldown.

Also I know it might seem kinda unconventional, but you do wanna keep Kushina in that front row middle slot so she can get hit as much as possible and scale up her ninjutsu and critical quickly. You shouldn't have too much of an issue keeping her healthy with this team. Also, your Fire main's clone (and Sakura's slugs, and Ninja Dog Shiba if you use him as your main's mystery summon) will appear behind her and give a buffer to the rest of the team.

You could also run this same team with Danzo in place of Minato (if you have two of Danzo's BT - you can BT him at 3 stars so it should be doable).

And these are the BT you want Danzo to have:

You can have his mystery at Y+1 if you can't get Y+2 (if you do this, switch from the clone passive to the Bani chakra passive on Fire main so both Danzo and Kushina's mysteries can be used in round 1 if the situation calls for it). You want his barrier passive to be the Y form because that way it will boost Wind ninjas like Kushina, whereas in the normal form it doesn't include Wind ninjas. The other talents don't matter as much, if you get BT on them that's a nice bonus but not essential.

This form of the team has a little less healing (no Minato health regen) but you can Chaos an opponent round 1 which is really nice. It's a big part of why Edo Itachi is so popular. Danzo is basically working as a replacement Edo Itachi here. Use him to stop an opponent setting up a barrier, shields, etc.

Overall, the team variants I showed above tend to lead to longer battles. However, in timed events like Sage World Battlefields and Training Grounds, it's better to just win (or lose) fast so you can go on and do more battles for your time. For that I'd recommend these:

(Works best if you have Minato's bond skill mystery).

Also for both of these, Asuma should have his Y+1 Courage passive, Y Burning Ash chase, and +2 Pose of Invincibility passive. The teams still work if he doesn't have those specific BT, but they are better if he does.

Hope this helps. Good luck!

It's an ok team, but it's very offensive and doesn't have much support/sustain. Especially with Kushina, it really helps to have other ninjas on your team who will support her, rather than just doing damage on their own. For example, there is a common team with Kushina that's Kushina / Killer Bee [Seven Swords] / Earth main or Fire main / Kazekage Gaara (with breakthroughs). Bee and Gaara hardly do any damage on their own but they make sure Kushina is at her best. Ninjas that are strong individually are not always the strongest together and "weak" ninjas can often support strong ninjas better. If that makes sense.