As the title mentioned, it featured who I think is the protagonist being able to take command of a huge 'monster' or 'robot' (unsure of what type of thing it was that, if I recall correctly, was orange and transparent/see-through, seemingly made of energy. Might have had designs along its body of a different colour, white perhaps, but my memory is very hazy.
I can't be sure, but perhaps other characters could also take command of avatars of their own, they were all super huge, the size of small buildings I think. I don't even remember what shape this 'monster' would have had, whether it was humanoid or resembled an animal or something. This has haunted my memory for years.