Fire_Phoenix_02
I think the Summon animal isn't that important you can use one but he won't need it since he have knowledge and capacity that will help him create modern weapon and he is already a cheat the summon will be useless (especially against otsutsutuki For the nature énergie sage mode he can just go to the toads
thanks for the awesome chapter author san and as for a summon animal for Boruto I can't exactly give you a creature but you could search for beasts that are associated with yin and yang, life and death or beasts that are associated with wind and lightning because those type of summons could help boruto with his elements as well as his own new sage mode. because of the fact that if you want the summons to play a major role than you will have to take several things into consideration or if you want them to be just apper for some time and for Boruto to learn sage mode than no problem choose whatever you want but if you want them to be significant then house wisely author san.