Rucus is a pain if you're the only one attacking him but if you have movement speed, use explosive flask and use weightless to evade him then its easier to counter as long as you move like a bat out of hell; only this one has a potion launcher.
Every Champion that is on a killing streak will give their killer extra credits to spend. If you are on a streak SOMETIMES it may be worth jumping of the map before Lex can make you his retribution target and gain even more credits.
With good game sense & map awareness you can counter Androxus Ult. Use your ultimate directly on him (if possible) or walls near him. Hitting terrain will trigger AoE Stun and interrupt his ult. Good aim required.
Whenever you're up against a Maeve, your Fireball will be necessary as Maeve is more than able to kill you from a distance. If you're alone with a Maeve and not at low health, you can put up your shield and retreat, or burn her with the fireballs.