Uhhh, that's difficult...
Sure, without Littlefoot the gang wouldn't be the same. I'm not sure, whether they'll stop being together or stay together. There's no doubt that Ducky and Spike will stay together

And Petrie's very close with the little swimmer, too...
hmm :unsure: ..........
Cera might leave them.
hmm... Ruby, Chomper and Spike wouldn't be THAT worse imo
Petrie... I'm not sure... It'd definitely be a big impact, if Petrie dies. He's funny and adorable...and sometimes his flying abilities are very useful for them, though, e.g. in LBT 9.
Without Cera it'd be much more peaceful than with her no doubt. But losing her would mean for them that they lost their strongest member...
And Ducky... Well, she's very funny and adorable, too. She brings a lot of positiveness and cheerfulness into the gang. And she is a interpreter of Spikes grumpings. Spike would be kinda alone without her...
It will be a big impact, if Ducky dies no doubt
imo Littlefoot is the one, whose death would be worst. The votes, which are done so far, show that well( 4 LF 1 Ducky) Since Ducky is my favourite character she'd tie with Littlefoot.
I'll vote for Ducky because she's the one, whose death would hit ME worst. For the gang, Littlefoot is the one, whose death will be worst.
Of course everyone should stay alive

I don't want any of them to die, that would make me really really really sad
Not even (the) sharptooth should have died, imo
