It would make evo more powerful, but evo potions and fusion allows for insanely powerful characters late in game regardless. Mutagen potions are currently only good for filler traits unless you're lucky. Letting evo adapt early would break the balance but late game, it's more like flavouring. With essences and divine favours, your mc can barely keep up. Probably conflicts with evo's unique character mechanics but just before the true end final battle, it would be getting serious before facing the final boss. Lorewise, "finally, after all these years, this is my final form." And if she could carry the trait onto new game plus, that would be a bonus.
Flavoring would be already more like, you already get like 3 powerful skills if you absorb the power at the end along with a trait, and getting more, in my opinion, which would mean you would be a trait machine that is pretty much is the strongest character in the game aside from maybe 1 specific elite that can absorb others, excluding the egg mastery essence, and further, would make the game trivial - while it is already challenging to fight the special path bosses, making that trivial by giving on demand traits like defensive, siphon, lumbering, and other things that you already can get for units would completely set the balance off the rails. And it better stays that way, no one likes when 1 character turns from already too good to pass especially at higher difficulties into an outright must have, that makes others obsolete.
The main character can't keep up - wait, she already is very good, once you invest into all proper skill upgrades, have the trait that gives extra levels and extra permanent item uses, unlock the special form and especially if you have the god profession, you'll have like, 300+ health in the end, if you take every health upgrade possible, but let me count the bonuses; empowered, god, telekinetic, due to fact there's more magic upgrades than strength ones its pretty much must have, all health upgrades - and then, if you experiment with mutagen and get lucky, you can add lumbering and heavy into the mix, which would mean even more health, and if you have the god profession, you pretty much become exceptionally hard to kill. Adding more into what is already the strongest potential wise character means no one will play the other ones, because either they have to be changed/buffed to match such powerful limits, or the powerful one has to be nerfed for obvious reasons.
Essences obviously, if they are the right ones, can skyrocket your power, but most of the time, you get ones that are questionable, and fairly unreliable as a result. You still have to visit them for a chance of something good, but relying too much on getting the best ones via save scumming isn't exactly something I really like, if only they all were useful even if you can't make full advantage of it. And the reward for refusing it is just a crystal fragment regardless of rarity, I might point out, which is lackluster and needs to be changed, like more crystal fragments based on rarity, or something else.
Anyway, on my discovery on said robots; they are fairly great, I managed to get an B unit from the wild and noticed it had a strength growth of 2.0 alongside health growth of 1.5, which matches elite spirits like hell beast/sea serpent and higher than seedling dragon, on top of fact its both a centaur and can equip ranged weapons while having the sniper/quickshooter traits and is NOT an elite - and with profession that boosts their growth and allows you to create and upgrade them, well now that makes them really good characters to have, and even better, they can farm materials despite being infertile - more mythril to create more and upgrade them, as well to make mythril equipment on demand, and more crystal fragments that are otherwise pain to get in large quantities.
