Rammus probably needs a rework imo

Now, as a Rammus main myself, Riot would have to be VERY careful when going about this.

Now I feel like to keep his identity, he should still be a mobile tank

Imo, Malphite plays a role similar to Rammus but better, they both build armor and are engage champions, but Malphite does it all and better.

Rammus's Q is easily cancelled, you can also poke him out with spells, and simply just build a qss or take flash, his ulti is subpar at best with his lackluster speed outside of his Q leads to being only useful when pushing a lane, and as a jungler, he can't just stay in lane long enough to have it be useful, he's hard countered by just about any mage, and can never really outsustain most meta junglers in fights, his W is easy to avoid, and his E doesn't last long enough to have any real effect unless it's a hella fed adc.

When it comes to his design, it's a little out of this world compared to some of the freakier natural creatures of runeterra, he doesn't LOOK like a league of legends character imo, he looks like something you'd see in Dota

But along with the design, his voicelines, if Riot were to change him and his okays, that would ruin who Rammus is, his lackluster responses make Rammus Rammus, so you have to keep those, and incorporate that personality into a lore that fits the world and his gameplay.

I'm sure Riot won't think about touching up Rammus some to make him something other than a worse Malphite without ruining who he is, but it's a nice thought that they could make Rammus fresh without ruining his identity