Champions balanced on common normal/ranked SR games but broken on other maps/game modes?

is broken as hell on ARAM. There are no wards to put on the bush, he can potentially zone your entire team just by hiding himself on the bush. His pull usually means instant death because he can pull and his team can chain with CC/damage. It is way easier to pull someone on ARAM because your team will generally be grouped. Also, he can afford to build more damage on ARAM, which means that his burst is even higher.

I've also noticed that tends to be broken on almost any game mode. Back when Hexakill Twisted Treeline was released, she was broken, as she could snowball very easily taking advantage of the Twisted Treeline level mechanics, and with everyone grouped thogether, it was easy to ult and get many kills. She was essentially the only champion in the game that could get hexakills. Games were decided by which team had a Katarina, or if both teams had a Katarina, the one who became fed first (not the one who played better) would carry the game. This made Hexakill TT incredibly unfun and unplayable. Thankfully, Riot introduced bans on the next time they released this game mode, allowing me to get rid of this problem champion. Katarina was also broken on URF because there she could spam her abilities non-stop, including her ult, and with a single Hextech Gunblade she was essentially unkilable.