Villain is 50/25 fold to cbet ca 40%, pot donk a ton, often many streets, happened he did this with 0 eqity hand. Biggest question is flop, do we even try to do anything without knowing if he is capable of folding?

PokerStars, No Limit Hold'em - $0.10/$0.25 - 6 players
Replay this hand at UpswingPoker.com

Player 1 (HJ): $25 (100 bb)
Player 2 (CO): $25.66 (102 bb)
Player 3 (BU): $43.19 (172 bb)
Player 4 (SB): $25.20 (100 bb)
Player 5 (BB): $35.21 (140 bb)
Player 6 (MP): $25 (100 bb)

Pre-Flop: ($0.35) Hero (Kupi007) is BU with J♥ Q♣
S.Artsiom.O. (MP) folds, revo444 (HJ) folds, verrücktermann (CO) raises to $0.50, Kupi007 (BU) raises to $1.62, Hamilton_TD (SB) folds, EngineerRoma (BB) folds, verrücktermann (CO) calls $1.12

Flop ($3.59) T♥ T♣ 2♥ (2 players)
verrücktermann (CO) bets $1.72, Kupi007 (BU) raises to $4.66, verrücktermann (CO) calls $2.94

Turn ($12.91) 7♦ (2 players)
verrücktermann (CO) checks, Kupi007 (BU) checks

River ($12.91) 2♠ (2 players)
verrücktermann (CO) bets $19.38 (all-in), Kupi007 (BU) folds

Total pot: $12.91 (Rake: $0.58)

Showdown
Player 1 (HJ): $25 +$0
Player 2 (CO): $31.71 +$6.05 [Mucked]
Player 3 (BU): $36.91 -$6.28 [J♥ Q♣]
Player 4 (SB): $25.10 -$0.10
Player 5 (BB): $34.96 -$0.25
Player 6 (MP): $25 +$0

How big is your sample?

after hand was like 90 hands, this was about middle of the session
plan was to raise and bet favourable turns, got blank, but i wassuspecting guy to becrazy enaugh to call turn with junk and jam all rivers

Well judging by his name, you should expect villain to be crazy.

Why do you 3bet a maniac with QJo in the first place?

Here is a relevant video !

https://youtu.be/sn3ndC5sUBU?si=pYTWXM-qKzAMuPhE

thx for link, as for qj 3bet, its for value

50/25 with 40 fold to cbet looks more like a standard fish not maniac.
Pre flop is close. I would just call flop, raise is ok but you gotta to keep betting, fish don't fold to much vs raise but they do if you keep betting.

I had another session against same player today, that maniac whale tag was a miss, he God run today, not impossible he God run yestarday as well. It's really annoying, but if players run like Gods, we have no idea how they are playing actully. He is a bit splashy, way more merged than i tought....