What kind of business can one start with N100,000 in Lagos?

Depends on the location you find yourself, kindly do your visibility studies and decide on what your environment need most.

Food stuffs business.

POS Business or mama put Business can be manageable for that amount.

Try cheap and affordable things like cold zobo, water, cooked eggs and peppered Pomo. It’s not like you will make millions at one time, but it will give you more gain than food. Food is now very expensive and so selling 100 naira or 200 naira food with a start up of 100k will only make you lose your money. Adding all together can give you like 5 to 10k daily with POS by the side.

It depends on d area so study what moves for you in that particular area