Since I'm mostly a Nintendo person, I'll just say Nintendo.
But I immediately think of
Mario
Animal Crossing
Fire Emblem
Golden Sun
Splatoon
Zelda is of course another one but like it's really hard to narrow it down to 5 lmao
[Switch Friend code: 3909-3991-4970]
[Xbox Live: JissuWolfe]
[PSN: Jissu]