You know, I'm still suffering from the fact that they didn't give Obito a legitimate summoning jutsu. I mean, he had the Gedo and the Kyubi, but they were due to a time limit and what I'm going for is a more "normal" summon, like the one with Kakashi's dogs.
I usually think he would have a fun mole summon, at least like Tobi. It would be very fun to see him place bombs underground while the moles help him or distract the enemy.
Going for something more serious, I would say that it would have a summoning of wolves.
Wolves are considered by many people to be solitary and solitary creatures, which is false because wolves depend on their teamwork to survive and obtain sustenance, forming packs and having souls etc etc. Although I remember that at some point in their lives, when the wolves stopped being puppies, they began a 'journey' as adults until they found a pack to which they belonged.
Without a doubt, teamwork and camaraderie was something that marked Obito's life, with his legendary phrase that we all know through Kakashi's mouth. That was how his shinobi path began, regardless of what happened next. And even after that "later", camaraderie remained fundamental for this Uchiha, in a darker or twisted way, but still there at the core. The moments that stand out from this were his trust in Kisame, how he protected him from an attack even though Kisame was completely capable of defending himself.
Or when he was angry at Konan for betraying him. Obito credits the Akatsuki as tools for Infinite Tsukuyomi, but when they die he ends up thanking them for their efforts, even when most of them only participated in the hunt for their own interests.
In short, Obito never stopped appreciating his companions, it was just that hatred destroyed his own philosophy of not abandoning them.
On the other hand, as a child, Obito was considered far inferior to Kakashi, despite his Uchiha genes. Although we don't know the Hatake clan very well, it is clear that the Uchiha has more dominance. Watching Obito lose to Kakashi is like watching a wolf lose to a dog. And I really don't know if you've heard that saying about "a dog raised in a family of felines", but I think it completely complements Obito and how he couldn't adapt to those who would become his family.
When Obito loses his team (post kannabi accident), it is the same as a wolf losing its pack and being vulnerable to more ferocious creatures and famine. Having to coexist with others like Akatsuki to move forward, being truly alone and just keeping watch. Lonely until he manages to redeem himself through the combined words of Naruto, Kakashi and Minato.
Obito has this appearance of being lonely and dangerous, and he is, but deep down, he wanted to return to what he could consider was his family. Very similar to the wolf, huh...
Wolves have their strength in their pack, where the group hunting strategy is a pillar for their survival. Obito was alone and away from his clan as an outcast, weak because he didn't have someone who would take the time to really motivate or teach him (Minato is not a good sensei, sorry), and wolf cubs need training to learn to hunt and be strong.
In short, Obito is the idea of a wolf who lost his pack and had to survive by adapting to loneliness alone.
