Free Agent - NA
Best champions in low competitive and casual gameplay (Bronze - Silver) These champions fit well in the lower ranks, where people tend to group up, have bad aim and be very, very stupid.
ss
These champions are the absolute best in the lower tiers, due to their very high damage (Moji, Bomb King, Viktor), ability to cause high splash (area) damage (Willo, Bomb King, Moji) or their very powerful ultimates because enemies are always grouped up (Viktor, Bomb King). In Bronze and Silver tiers, you will see at least one of these champions banned every match. Every single match.
s+
s
These champions hold a strong place in the low ranked area due to their high, effortless damage (Tyra, Lian) auto-aim attacks that require a very low skill cap (Lian) or their high HP and strong shielding value (Barik)
s-
S- champions vit relatively well in low trophies with their high, easy damage without needing to move (Vivian, Strix) their high assassin value (Koga, Evie) and their strong abilities against noobs and beginners (Furia, Makoa)
a+
These champions do not really stand out in low trophies, but are still viable in a lot of cases thanks to their heavy damage with necessarily moving (Kinessa, Ruckus), their ability to chain kills (Zhin, Imani) or their high life and shielding value (Ruckus, Terminus, Ash)
a
These champions do not stand out in low trophies. That is due to their need for accuracy and good aim , which beginners usually don't have (Sha Lin, Lex, Cassie) their weak damage (Fernando, Grover, Grohk), their low healing abilities for a healer (Grohk, Grover), their high skill cap/complicated abilities (Sha Lin, Mal'Damba) or their weak ultimates (Sha Lin, Lex, Cassie) - (note that Cassie's ultimate, useful in high trophies, is really useless in low trophy areas where enemies are very rarely hidden and never set ambushes)
a-
Champions in the A- tier are not suitable in low trophy areas. They can be used in very few cases, where your team is ideal for the given champion and the champion counters a lot of enemies. They lack strength due to their very low healing abilities (Jenos, Pip), their need for VERY good aim (Androxus), their very low damage (Torvald, Talus, Buck, Jenos) or their very weak ultimates (Talus, Buck).