MP3 is loose/passive.

PokerStars No-Limit Hold'em, $2 BB (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($195)
BB ($164)
UTG ($42.50)
Hero ($236.75)
MP1 ($181.30)
MP2 ($197)
MP3 ($207.85)
CO ($35)
Button ($270)

Preflop: Hero is UTG+1 with A, A.
UTG raises to $4, Hero raises to $10, 2 folds, MP3 calls $10, 4 folds, UTG calls $6.

Flop: ($33) 7, J, 6 (3 players)
UTG checks, Hero bets $28, MP3 raises to $56, UTG calls $32.50 (All-In), Hero ...

What it do?