Please understand that these ‘observations’ are from my own personal experiences playing on-line poker for over 10+ years and are in no way intended to disrespect anyone. These are just some things I noticed throughout the years:

1. Pet Avatars – Anyone that has a pet basically loves their pet unconditionally…but loving your pet so much as to make him/her your avatar is a way for a player to show they are sensitive (especially towards others)…which tends to show they are usually a passively careful tight player. I’d suggest min-calling & medium-value betting, b/c if re-raised, there’s a high probability you’re beat (unless you’ve got the nuts of course). That being said, you can steal allot from them as well.
2. Hubby’s/Wives/Kids/Babies – I call these the ‘time constraint’ avatars. Usually very careful & tight players, but for a limited amount of time. After about 45 to 90 minutes, you will notice change in game play (a bit more aggressive) b/c their patience is lost due to not doing as well as they think they should have done…therefore trying to speed up the game by taking more chances. They can be semi-bluffed out of the small-medium pots, but you can take them to the cleaners by calling all the way to the river with the nuts as they will usually over bet the river all-in to presumably scare you (no patience-lack of stamina).
3. Poker Hand/Poker Pro Avatars – American Airlines, Cowboys, Big Slick, Phil Ivey, etc… players that read up on the game (Literally, by the book players)really wanting to learn more, but usually play the same novice-like way they’ve always played. Probably the easiest to read b/c they bet the value of the cards they’re holding…therefore they are also the easiest to bluff & steal from as well. When things don’t go their respective ways, they blame everyone for not playing correctly.
4. Sports Team Avatars – The true prideful sports fan treats poker like a sport, drinks a bit, & is usually watching/listening to their team play while playing poker themselves. IMO, poker is not a sport b/c it’s not very ‘sporting’ due to the countless amount of deception involved which is one reason it’s more for 21 & overs, not for children to learn it’s OK to be deceptive early in life. Already distracted, these sports fans can be easily distracted even more through chat. They will vary their play depending on their mood…so if their team is winning or has been winning…they will play more confident on the aggressive side…otherwise…there’s a certain chip on their shoulder to be successful so they don’t bluff much, but will go all-in allot with top pair on the flop.  You can slow play higher pocket pairs & take them down.
5. Adrenaline Rush/Extreme Avatars – Rocket ships, muscle cars, snowboarding, etc…displays an ‘I’m in a hurry’ (caffeine-up) type player.  These impatient players can be easily put on tilt…so get them there! With a decent hand, check-raise & re-raise their bets b/c they will take it personally & can’t help but to oblige you with a mediocre hand. They will try to out-bet you in the moment no matter their hand, ie, ‘I have to win this hand…forget the rest’ attitude.
6. Me, Myself, & I Avatar – A self-portrait photo usually signifies an ego-centric…hey look at me aren’t I nice looking…now give me a compliment…kind of player whom may or may not be narcissistic…but if shown wearing sunglasses…then highly probable a narcissist. These are the type of players that will call about 2/3 to 4/5 of the pot bets (but don’t match the pot or over bet) all the way to the river with the 2^nd/3^rd best hand to your best hand. If you choose not to bet the best hand on the flop or turn…they will bet it for you…but you must partial-pot bet the river as they will check it.
7. The Good Causes/Charity/Thoughtful Avatars – usually knows the math consciously or subconsciously (ie, can’t explain it, just knows it)…but makes moves according to the best percentages.  They are not frequently out-smarted and don’t fall for too many traps, so be careful.  You can play them straight-up for a while to notice their trends…then use it against them.  Sounds weird, but they are the ones I notice with a bit of luck in their play as well.

So if there are players like me that may use a biasness of decision-making in on-line poker due to a player’s avatar…wouldn’t it be smart to maybe give others information through your own avatar in a reverse manor?  If you know you play very tight…pick a fast car avatar, etc.  It just may fool…ME!!!