So, we've already got:
Berries and cream thing
Cheesecake
A lemony thing
Tiramasu.
35 people divided by six desserts, so I think you'd need to do something that served about eight.
There's already a lot of creamy and quite squishy textures and of the obvious, popular flavours that are missing there's chocolate, something fruity that isn't berries or lemon and without getting too avant garde, not much else.
Apart from fruit salad which is a really good choice but has already been mentioned here's my best idea.
Mango and passionfruit curd tart with a biscuit base. You make the mango curd the same as you do lemon curd and you only need 1 big or two medium ish mangos, (mangoes?) so not as expensive as you might think - or maybe even tinned mango.
You could do a usual digestive biscuit base or use coconut biscuits or a bit of dessicated coconut to make it fancier.
I've tasted it with biscoff biscuits or ginger in the base too but that was a bit too punchy for me but opinions will vary. I was nearly won over by the ginger one but not quite.
This is the general idea but has a pastry base, which isn't as nice and too much nonsense to get into - unless you want to, or you could buy one - but this gives you the general idea:
https://www.bbcgoodfood.com/recipes/mango-passion-fruit-curd-sunshine-tart
Biscuit base recipe
225g biscuits
100g butter.
Either no bake and just chill or put it in the oven at 180 for 10 mins.
I thought of Key Lime Pie as well but we're getting too close to lemons and cheesecake.
I thought you could get away with the biscuit base if the filling wasn't creamy.
Anyway, it's easy enough and here's Mary Berry's version which is the simplest I've seen:
https://maryberryrecipe.co.uk/mary-berry-key-lime-pie-recipe/
There's several traybake threads on Mumsnet too - for things like Fifteens and Tiffin but they might be too teatime-ish for a dessert.