Dungeons & Dragons 3.5 Monster: Kobold, Fighter 5

You get a +2 bonus on all Listen checks and Spot checks.

The master of a familiar gains the benefit of the Alertness feat whenever the familiar is within arm’s reach.

You can respond quickly and repeatedly to opponents who let their defenses down.

A character without this feat can make only one attack of opportunity per round and can't make attacks of opportunity while flat-footed.

When foes leave themselves open, you may make a number of additional attacks of opportunity equal to your Dexterity bonus. For example, a fighter with a Dexterity of 15 can make three attacks of opportunity in 1 round-- the one attack of opportunity any character is entitled to, plus two more because of his +2 Dexterity bonus. If four goblins move out of the character's threatened squares, he can make one attack of opportunity each against three of the four. You can still only make one attack of opportunity per opportunity.

With this feat, you may also make attacks of opportunity while flat-footed.

The Combat Reflexes feat does not allow a rogue to use their opportunist ability more than once per round.

A fighter may select Combat Reflexes as one of their fighter bonus feats.

A monk may select Combat Reflexes as a bonus feat at 2nd level.

You are adept at dodging blows.

Dex 13

During your action, you designate an opponent and receive a +1 dodge bonus to Armor class against attacks from that opponent. You can select a new opponent on any action.
a condition that makes you loose you Dexterity bonus to Armor Class (if any) also makes you loose your dodge bonuses. Dodge bonuses (such as this one and a dwarf's racial bonus on dodge attempts against giants) stack with each other unlike most other types of bonuses

A fighter may select Dodge as one of his fighter bonus feats (PH 38)

You can react more quickly than normal in a fight

You get +4 on initiative checks

A fighter may select this feat as one of his bonus feats (PH 38)

You can make exceptionally powerful melee attacks

Str 13

on your action, before making attack rolls for a round, you may choose to subtract a number from all melee attack rolls and add the same number to al melee damage rolls. This number may not exceed your base attack bonus. The penalty to attacks and bonus to damage apply until next turn.

If you attack with a two-handed weapon or with a one handed weapon wielded in two hands, instead add twice the number subtracted from your attack rolls. Can't add the bonus from power attack to the damage dealt with a light weapon (except with unarmed strikes and natural attacks), even thought the penalty on attack rolls still applies, (normally, you treat a double weapon as a one-handed weapon and a light weapon. If you choose to use a double weapon like a two handed weapon, attacking with one end of it in a round, you treat it as a two-handed weapon)
A fighter may select Power Attack as one of his fighters bonus feats (PH 38)