Tyberius cannot be any further upgraded as a pet. He is currently at his max. This is established.
The hammer, on the other hand, is still a maybe. It has to be getting close though. We can still fuse Tyberius with something else to make it more awesome, but Tyberius is no longer upgradeable. And if we upgrade now, before we get a replacement pet, we'll be at a disadvantage next fight, since the enemies' attacks won't be split between the two of us.

I edited my previous post. read it.

Wow it pretty interesting, how will be look John after merging with tyberius :D

I understand the situation now.

Still, we need a replacement pet, or to just not mix Tyberus.

why not try to make it so you can see?

That clockwork toy thing with the orb we found, and then put any mechanical parts we can onto it.

seconded!

This!

But go to store first to see if there are any metal objects to buy and use on our new clockwork walker pet thingie. And especially stuff that would fit in the arm molds.

thirded !!!

Interest, lets try to make it

It either makes an epic pet or a new weapon or a bomb.

Or it chould be a Complete and utter waste of the orb, as we dont know what it does yet!

So I say we mix the clockwork toy with the giant cog. Then, if something cool comes out, we can mix tyberius with it and hopefully get a better pet.

Mix the toy with the orb, then mix the toy+orb with Tyberius. Toy being Dominant both times.

Spoiler

Marshall is a perfectly normal person. The reversed-genders thing is unique to viola's sector. From what I can see, he's probably in the same sector Edgar was. ('SRSBSNS') sector. Viola was in ANTIGENDER section. Sturm is in the SANITY sector, not quite sure where vera is.