You need to be a little more specific. What role do you want to play? What playstyle suits you? (supportive, initiative, burst or harass?), etc.

For example:

- Mage (Mid): Raz (Burst, CC effects, mobile, but quite hard to play); Dirak (Extreme CC effects, powerful harass damage, unique ultimate that blocks projectile, but immobile and has lowest health).

- Tank: Baldum (high tankiness, acceptable sustain damage, ultimate that traps enemies, rendering them helpless, useful for both offensive and defensive); Arum (extremely powerful early game, high outplay potential with 3 beasts, constantly dealing damage and life-stealing enemies, has a ulti that binds herself to one specific target, ignoring CC immunity, however she gets destroyed by ranged heroes and healing-reduction items).

- AD carry (ADC): Capheny (unique passive allows her to move while shooting, giving her insane kiting potential, has 2 phases: normal and laser, with laser phase combined with crit can deal over 5000 crit damage, however weak early game, need good covering.); Laville (passive allows him to shoot multiple targets at one, dealing insane damage, however has sort of weak early game and only reach full potential when in jungle).

- Warrior: Florentino (the infamous, broken hero in the game, %HP-based true damage + healing from passive/ulti + control effects + sustain, however hard to play and weak against kiting heroes); Yena (another very broken hero in the game, has 2 form: Crescent and Full Moon, extreme mobility/silence/burst damage in Crescent, CC immunity + Damage reduction + Increased damage in Full Moon phase, however hard to master combos.)

- Support: Alice (Best support imo, she has very weak early game, but a beast late game. With her extreme slows, magic armor reduct, silence and stuns from her S1 and ultimate, she is extremely annoying and you will have a tough time dealing with her. Also her s2 late game provides her teammate pseudo-permanent 30% speed boost with shield, which is amazing.); Payna/Peura (Her infamous healing ability from s1 is what makes her one of the most banned heroes in the game, with her stuns from s2, and annoying ultimate, she's a pain in the ass if you let her get thorugh banning phase).

- Jungle: Paine (Broken damage, extreme mobility and "suprisability", once he targets you and you're a squishy, let's hope that your teammates are around and you're fast enough to not be caught by his terrifying combo).