Most reactions in the game?

[Ravingdork]

By (ab)using the multiclass archetypes, how many reactions can we get on one character in a single round?

[Xenocrat]

A 20th level Fighter can get one reaction for every enemy, pretty impressive if you get some reach to smack down everyone who moves or get one of those unbreakable shields and get yourself surrounded and pounded.

[shroudb]

Since i think only Champion and Fighter get extra reactions, i think the maximum is a Shield and Gauntlet Fighter
1)whatever
2)dueling parry
4)champion MC
6)Champion feat
8)Quick shield block
10)combat reflexes
12)dueling parry
14)imp dueling parry
16)quick block from Champion (if your GM allows it as a different feat)
18)paragon guard
20)boundless

for the most part, from level 8 and up, when you get each feat is highly mutable.

you have:
1 reaction
1 reaction only for AoO
2 reaction only for shield block (your shield is permanetly up)
1 reaction only for Parry (you don't need to be in stance to do it)
1 reaction at the start of each opponent turn