Here are the top Final Fantasy games as ranked by viewers in NHK's (The Japanese public broadcaster, like BBC/PBS) Final Fantasy Grand Poll, which aired on Saturday night.

1. Final Fantasy X (2001)
2. Final Fantasy VII (1997)
3. Final Fantasy VI (1994)
4. Final Fantasy IX (2000)
5. Final Fantasy XIV (2013-)
6. Final Fantasy V (1992)
7. Final Fantasy VIII (1999)
8. Final Fantasy IV (1991)
9. Final Fantasy XI (2002-)
10. Final Fantasy XV (2016)
11. Final Fantasy Tactics (1997)
12. Final Fantasy III (1990)
13. Crisis Core: Final Fantasy VII (2007)
14. Final Fantasy XIII (2009)
15. Final Fantasy XII (2006)
16. Final Fantasy Type-0 (2011)
17. Final Fantasy Crystal Chronicles (2003)
18. Final Fantasy II (1988)
19. Final Fantasy X-2 (2003)
20. Mobius Final Fantasy (2015-)
21. Lightning Returns: Final Fantasy XIII (2013)
22. Final Fantasy Tactics Advance (2003)
23. Dissidia Final Fantasy (2008)
24. Final Fantasy (1987)
25. Final Fantasy Crystal Chronicles: Ring of Fates (2007)
26. Dissidia 012 Final Fantasy (2011)
27. Final Fantasy Adventure (Seiken Densetsu: Final Fantasy Gaiden; Mystic Quest [EU]) (1991)
28. Final Fantasy XIII-2 (2011)
29. Final Fantasy Crystal Chronicles: Echoes of Time (2009)
30. Final Fantasy Record Keeper (2014-)

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MUSIC (Top 10)

1. Zanarkand (X)
2. Clash On The Big Bridge (V)
3. Eyes On Me (VIII)
4. Searching For Friends (VI)
5. Blinded By Light (XIII)
6. One-Winged Angel (VII)
7. Aerith's Theme (VII)
8. Melodies of Life (IX)
9. Final Fantasy (Main Theme)
10. Those Who Fight Further (VII)

CHARACTERS (Top 10)

1. Cloud (VII)
2. Yuna (X)
3. Aerith (Aeris) (VII)
4. Vivi (IX)
5. Zidane (IX)
6. Emet-Selch (XIV)
7. Tidus (Tiida) (X)
8. Lightning (XIII)
9. Tifa (VII)
10. Zack (Crisis Core)

BOSSES and SUMMONS (Top 10)

1. Knights of the Round (VII)
2. Kefka (VI)
3. Hades (XIV)
4. Anima (X)
5. Omega (V)
6. Valefor (X)
7. Braska's Final Aeon (X)
8. Bahamut ZERO (VII)
9. Syldra (V)
10. Safer Sephiroth (VII)

Full results are posted here in Japanese, most of the mainline series also have voter breakdowns by age range/gender. A knowledge of Final Fantasy and basic Japanese is a lot more useful here than mastery of kanji: https://www.nhk.or.jp/anime/ff/