Age: I feel like if he's not bald everyone would freak. I can deal with him being in his 40s and not 70s.
Limpwalk: Crippled. Just show that he has sustained an injury. I don't need him limping as long as they can show that he suffered an injury and live through it
Beatrice: I feel as though that's a part of his character that will be around regardless. Lore wise, Janna's Zephyr became her. She is the bird that always flew around her, so at the least, I would asume that Beatrice would still remain somewhere for his VGU.
Shape-shifting: Not necessary. Shape-shifting was a game play thing. If he does transform, it's because he used necromancy and dark magic as we know he went through Boram's tomes as well as dealt with the Black Rose; however, I wouldn't bother freaking out or be surprised if his transformation is not a giant bird demon.
It's not really about keeping the EXACT same item or thing. It's about taking a detail, breaking it down, and re-imagining it. Everyone chooses specifics as opposed to generalizations of said character.
Because, let's face it: as drastically different as what Poppy and Galio may appear from their pre-rework selves, there are plenty of similarities that connect them.
Afterall, while Poppy may be oblivious, she's still stubborn, strong-willed, and determined. Her perseverance which lead old Poppy to take the helmet to Jarvan is the same concept of perseverance that leads her to constantly search for the her, and when it feels like she'll never make it or fail, she looks around her. She looks in her hand at what must be done, and she does it. That was Poppy's core as a character: Indisputable determination and perseverance.
Also, Galio's identity is a stalwart, stone construct made to defend and protect. Old Galio failed in his purpose, failing into despair as he found himself unable to do the one thing he was meant for, safeguard and protect against enemy mages. A lone, sad yordle rested below him, wallowing in despair, but said Yordle refused to give up and keep moving. Galio, in turn began to move again and leave his dormancy to do what he does: protect.
New Galio is a construct to stop enemy mages, but he runs off magic, the thing he's meant to stop. Because of this, when he fulfills his purpose, he goes into dormancy. He is dormant because he can't do the one thing he was made to do: defend. One day, a lone, sad girl walked up to him, wallowing in her despair, began to grieve. Because of this, and her latent magic, he began to stir and then life returned to him.
^^^
You get what I'm saying, right? It's all same concept but the execution and details in between are different.
That's why age shouldn't be hyper focused on "old and crooked", but rather "long-lived" or "experienced". His age should showcase a certain amount of years of experience. Which means, he can get away with being late 30s to early 40s to accomplish that. Years after would be dependent on when they "pick him up", so to speak.
The limp shows he survived something that should have stopped him and kept him from rising to the top. It doesn't have to be him limping. He could actually be missing an arm in his new VGU and it accomplishes the same task; though the bad leg is VERY preferred.
The transformation should show his corruption through magic, so it doesn't have to be the demon bird or showcase the exact same way as we're use to seeing. Hell, it may not even be as extreme if they execute it right.
And Beatrice, a connection to a bird. To an unknown entity that is suggestive of something sinister. In all honesty, if they keep the concept of Beatrice, she may actually stay the same. I can't figure out another way of showing that damned bird unless--you know, she doesn't appear as a bird.