Mine are some spirits
Baki the ultimate defence and his brother banu the ultimate attack
Eff Baki has a shell what is impossible to break and I could summon it as a shield and baxe has a horn.on the top of his head witch is one of the strongest weapons in the kingdom and he turns in to a sword and I can summon them both out and use them at the same time ( there forms are a turtle and a rhino ) (S RANKED)
And it is summoning jutsu
And another is thor the god of thunder this is a forbidden jutsu and I will only use it if my village is in danger it appears as a normal cloud to my opponent but to meet it is a massive being made of thunder and can roast his foe with a snap of his fingers if u have the displeasure of meeting it u will definitely die (S RANKED)
And this is forbbiden summoning jutsu
There will be more but these are just some I have just thought of