Future Antman stuns on combo enders
Having a minimum 10% chance of being stunned while ending a combo against this guy is a really bad idea as it will inevitably be treated as a 100% chance by most players, especially in competitive content.
Many champions (especially non-meta relevant ones) require ending a combo as part of their rotation, or simply sacrifice too much damage (that they already don't have) by not ending a combo. Whereas the already insane champions, IE Herc, Hulkling, Doom, Tigra, KP, Nick, Apoc, AA, Kitty, Magneto, Ghost, QS, Valk, list goes on... can avoid the stun completely in their main rotation or have anti-stun mechanics. I wouldn't mind this as much if it was a one-off, but more and more champions solely exist now to be countered by S-tier champions, leaving everybody else behind.
Why does it matter though? Honestly, if this was the first champion to have this kind of mechanic, I wouldn't care at all. But it is becoming increasingly too common for Kabam to create champions that are to be countered by newer champions 6 months down the line rather than the older champions which are quickly becoming outdated with each passing day.
Tl;dr Future antman has a stun mechanic that imo only increases the disparity between OK champions and the S-tier champions which isn't good for the game.