are there any other coins that have a halving coming or who just have halvings like ltc and btc?
LTC halving is pretty new to me. I know BTC halved to BCH, but not too sure if LTC also halved. Maybe Ethereum will halve too in future to Constantinople.
You referred to fork, fork and halving are two different things. Right now, the block reward for btc is 12.5 BTC per block and it will be reduced 6.25 BTC in 2020. That's what halving is.
OP, I am interested in one PoS coin, namely DeepOnion. The stake reward for the first year was 10%, which has now turned to 5% this year. After this July, it will be 1% stake reward only. Getting ONION will be harder than ever.