Flower Knight Girl

1) Optimal 'pay' gacha use is limted - the basic one you'll be swimming in
2) No PvP so basic events are clear able early and reward nicely - shortly you'd be able to max um
3) You can get upto the 3rd level out of 5 for free rolls. Level 4 from events and 'pay' gacha but the currency keeps trickling in - Level 5 is rare - bt not required
4) Dupes aren't NEEDED and until a certain point in the game not even desired. The basic units you'll max - levels 4&5 each dupe gives a 2nd equip slot (upto 4) and a skill up (most start at around 20 -30% a turn chance eack skill level adds a few % upto skill level 5) - evolving is done with a different free to farm and not difficult to get item, and you evolve ONCE currently, leveling is done again with free faramable goodies (mostly - you can use dupes but that early on gets a poor choice)

Otherwise Idol girls is good as above but I found it too much, its not as intuitive