thelightedghost
I think Erunesti Echevalier the mc of Knights & Magic anime is solid choice in this. An programmer and gundam enthusiasts (addict if you aks me) isekaed to world where magic exist and he made silhouette knight from scratch even made the smaller one for labour much like an suit. Tony is good and Ken already have thor so its kinda nice making a suit that can be recharge/empored by his thunder.
for versatility I vote for child emperor for balance I voted for Sasori red sandfor funny sake I'll choose dr. Robotnicwhy notgenos don't craft his own limb same reason for astroboy cyborg tnt need mother box coola become useless same with transformersTony Stark have planetary scale power you already have thor so up to you