Little wooden trolley of wooden building blocks
Stacking cups and bath squirter toys
Couple of little cars - perhaps from a set/company like Fisher Price/Playmobil etc so others can add to it in time and build up to houses, trains, people...etc
Dolls and clothes to change - there are plenty of dolls that are good for both boys and girls
Shape sorting toy - Fisher Price do nice ones
Books:
Board books to read and pull at now, especially with different textures to explore
Small reading books - little stories to read together - there are so many choices out there, some are lots of pictures, some have lots more words, and across any subject you want to think about!
The Hungry Caterpillar, Lost and Found, The Gruffalo, The Tallest Giant in Town, The Tiger who came to Tea, the Mog series, …..all sorts.
Classic books - hardback versions of things like Beatrix Potter tales, the Narnia stories, Wind in the Willows, etc, and there are also great collections of short stories for children too
Richard Scarry books on how things work, or other books like Usborne do nice ones about all the things you would find on a farm, and a different page about all the things you would find in an airport etc
Soft fluffy blankets will be useful too, especially as they start to get a little older to snuggle under or use as capes for imaginary play etc
A toy kitchen/shop - and lots can be added in time to come with crockery, baking sets, play food etc - and lots and lots of imagination games can go on - other good things (in time) for this could be a cash register and a little basket or bag to "go shopping", or small sweeping brush and pan set to be able to "help mummy and daddy"....
And while not a toy, if someone wants to get useful storage to put toys into - easily accessible for DC but also easy to tidy away into and with different sections so blocks can be kept separate from cars and separate to toy food etc.