this is a suggestion if you want him to rely solely on the taimanin there are a couple things you can do one make him a buff / debuff mage or a Healer so that he can make sure his higher power summons don't die so he doesn't have to summon them again or you could do a mixture of of the two types
Good chapter. Will you make this a crossover world? Because thaimanins are pretty op here, so you should add element of other franchises to spice things up and see mc on edge so that he would seek more powerful summons.
Also, will you summon Shizuru and Astaroth?