Well mc looking weak asf still doesn't make sense his parents are tall and built lol There has got to be some superhuman fuckery going which prevented mc from being built or mc really was just the most unlucky.
This has also been my theory from the get go. MC seems like damaged goods and the best assumption I can make is that his growth was stunted somehow. I used to think that he monsterfied but now Syla's meddling is as good a theory as any.
But it's set up so nicely for MC to Evo to lv 4 and build up power from there to level 5 where the true quality change is at. From lv 3 to 4 is only about the quantity of power.
As it stands, any evolution can introduce abilities that are complete gamechangers. For example Ella got her frozen form at level 5 but this evolution isn't described as very "creative".
With MC's unique circumstances, his 4th evolution has the potential to completely alter the way he behaves.
Currently MC can do 4 things:
1. Alter his form.
2. Alter the target's form. (Weak effect)
3. Retrieve memories.
4. Plant memories.
As it stands, the only truly supernatural combination is that he implants memories into his tails, giving them limited autonomy (at least that's how Syla explained it). Everything else isn't exactly a "combination" of powers. His memory powered transformations are a series of isolated events. Learn a form by touching, mimic the form by shapeshifting, use his intuition to improve the form, repeat.
Considering that level 4 is the limit breaker, potential limits to be broken:
1. He can implant memories to tails, but tails themselves are just pieces of flesh. What if his tails can also use his powers independently? What if any cell of his body can do it independently?
In fact I think this is kinda foreshadowed. When discussing with Henri about evolution, he says that "you won't always be in control of your powers". It's one of my theories on the "requirements" for the 5th evolution.
2. The body-memory interaction has only one direction, it's always memory powering body. What about the opposite?
While I have a bit of trouble picturing this, it makes sense that Memory powers are way more nuanced than what we've seen so far. There should be a way for Memory to get stronger using Body similar to how the opposite works.
3. MC isn't good at controlling clones of him and uses his tails instead. Breaking that limit could turn him into a clone army.
Lucius has that Power and it makes some sense that he is of Body's line. When Lucius explains how his powers work, he talks about implanting some amount of his power in his clones for them to persist. This is very similar to how Ella made her doll and the subsequent training with MC, but in a more immediate way.
Any implementation of these could fundamentally alter how MC works.